§ 1.21

Построение графиков

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Задача 1.21.1

Привести пример такой дифференцируемой функции y=f(x)y = f(x), x∈(0;+∞)x \in (0 ;+\infty ), что:

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(1)

ее график имеет асимптоту при x→+∞x \rightarrow +\infty, но lim⁡x→+∞f′(x)\lim_{x \rightarrow +\infty } f^{\prime }(x) не существует;

(2)

ее график не имеет асимптоты при x→+∞x \rightarrow +\infty, но lim⁡x→+∞f′(x)\lim_{x \rightarrow +\infty } f^{\prime }(x) существует.

Задача 1.21.2

График функции y=f(x)y = f(x) имеет наклонную асимптоту при x→+∞x \rightarrow +\infty. Доказать, что если f′′(x)>0f^{\prime \prime }(x) > 0 при x⩾x0x \geqslant x_{0}, то график приближается к этой асимптоте сверху, а если f′′(x)<0f^{\prime \prime }(x) < 0, то график приближается к асимптоте снизу.

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Задача 1.21.3

Построить график функции.

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(1)

y=x3−3x2+4y = x^{3}-3 x^{2}+4;

(2)

y=−x3+4x−3y = -x^{3}+4 x-3;

(3)

y=(x−1)2(x+2)y = (x-1)^{2}(x+2);

(4)

y=x24−3x+4y = \frac{x^{2}}{4}-3 x+4

(5)

y=x(x−1)3y = x(x-1)^{3}

(6)

y=(x+2)2(x−1)2y = (x+2)^{2}(x-1)^{2};

(7)

y=(x−1)3(x+1)2y = (x-1)^{3}(x+1)^{2};

(8)

y=32x2(x2−1)3y = 32 x^{2}\left(x^{2}-1\right)^{3}.

Задача 1.21.4

Построить график функции.

?
(1)

y=x2+x−1x2−2x+1y = \frac{x^{2}+x-1}{x^{2}-2 x+1}

(2)

y=4+x−2x2(x−2)2y = \frac{4+x-2 x^{2}}{(x-2)^{2}}

(3)

y=20x2(x−1)3y = \frac{20 x^{2}}{(x-1)^{3}}

(4)

y=(x−1)2(x+1)3y = \frac{(x-1)^{2}}{(x+1)^{3}}

(5)

y=x3x−1y = \frac{x^{3}}{x-1}

(6)

y=x3−2x2−x+2xy = \frac{x^{3}-2 x^{2}-x+2}{x};

(7)

y=1+x21+(x−2)2y = \frac{1+x^{2}}{1+(x-2)^{2}};

(8)

y=5x2+42x+77x2+7x+14y = \frac{5 x^{2}+42 x+77}{x^{2}+7 x+14}.

Задача 1.21.5

Построить график функции.

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(1)

y=x3x2−1y = \frac{x^{3}}{x^{2}-1};

(2)

y=(x−1)3(x−2)2y = \frac{(x-1)^{3}}{(x-2)^{2}}

(3)

y=(x−5)3(x−7)2y = \frac{(x-5)^{3}}{(x-7)^{2}}

(4)

y=x3+2x2(x−1)2y = \frac{x^{3}+2 x^{2}}{(x-1)^{2}}

(5)

y=x+7x−3x2y = x+\frac{7}{x}-\frac{3}{x^{2}};

(6)

y=(x+1)(x−1x−2)2y = (x+1)\left(\frac{x-1}{x-2}\right)^{2}.

Задача 1.21.6

Построить график функции.

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(1)

y=x4x3+2y = \frac{x^{4}}{x^{3}+2};

(2)

y=x4(x+1)3y = \frac{x^{4}}{(x+1)^{3}};

(3)

y=3x+6x−1x3y = 3 x+\frac{6}{x}-\frac{1}{x^{3}};

(4)

y=(x+1x−1)4y = \left(\frac{x+1}{x-1}\right)^{4};

(5)

y=x5(x2−1)2y = \frac{x^{5}}{\left(x^{2}-1\right)^{2}};

(6)

y=(x−1)5(x−2)4y = \frac{(x-1)^{5}}{(x-2)^{4}}

(7)

y=x5−8x4y = \frac{x^{5}-8}{x^{4}};

(8)

y=x5x4−1y = \frac{x^{5}}{x^{4}-1}.

Задача 1.21.7

Построить график функции.

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(1)

y=x+x2−1y = x+\sqrt{x^{2}-1};

(2)

y=x−x2−2xy = x-\sqrt{x^{2}-2 x};

(3)

y=(x+1)23+(x−1)23y = \sqrt[3]{(x+1)^{2}}+\sqrt[3]{(x-1)^{2}};

(4)

y=(x+1)23−(x−2)23y = \sqrt[3]{(x+1)^{2}}-\sqrt[3]{(x-2)^{2}};

(5)

y=x2+1−2x+1y = \sqrt{x^{2}+1}-2 \sqrt{x+1};

(6)

y=(2x+1)3/3+4xy = \sqrt{(2 x+1)^{3}} / 3+4 \sqrt{x}.

Задача 1.21.8

Построить график функции.

?
(1)

y=2x3+9x2y = \sqrt{2 x^{3}+9 x^{2}};

(2)

y=x2−x3y = \sqrt{x^{2}-x^{3}};

(3)

y=x3−3xy = \sqrt{x^{3}-3 x};

(4)

y=x2x+1y = x^{2} \sqrt{x+1};

(5)

y=x(x+1)3/2y = x(x+1)^{3 / 2};

(6)

y=x4−4x34y = \sqrt[4]{x^{4}-4 x^{3}}.

Задача 1.21.9

Построить график функции.

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(1)

y=x+2x2+2y = \frac{x+2}{\sqrt{x^{2}+2}};

(2)

y=x+8x2+4x+16y = \frac{x+8}{\sqrt{x^{2}+4 x+16}}

(3)

y=8xx2−4y = \frac{8 x}{\sqrt{x^{2}-4}}

(4)

y=4x2−1xy = \frac{\sqrt{4 x^{2}-1}}{x}

(5)

y=x2−4x2−xy = \frac{\sqrt{x^{2}-4 x}}{2-x}

(6)

y=x2x2−12x2−1y = \frac{x^{2} \sqrt{x^{2}-1}}{2 x^{2}-1}

(7)

y=3x−2x2−1y = \frac{3 x-2}{\sqrt{x^{2}-1}};

(8)

y=(x+6)2x2−4y = \sqrt{\frac{(x+6)^{2}}{x^{2}-4}}

(9)

y=4(x−1)2x3y = 4 \sqrt{\frac{(x-1)^{2}}{x^{3}}}

(10)

y=3x2−4x3y = \sqrt{\frac{3 x^{2}-4}{x^{3}}}

(11)

y=x23−23xy = \sqrt{\frac{x^{2}}{3}-\frac{2}{3 x}}

(12)

y=13x3x−2y = \frac{1}{3} \sqrt{\frac{x^{3}}{x-2}}

(13)

y=4xx2+1−x2y = \frac{4 x}{\sqrt{x^{2}+1}}-\frac{x}{2}.

Задача 1.21.10

Построить график функции.

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(1)

y=1−x33y = \sqrt[3]{1-x^{3}};

(2)

y=x2(3−x)3y = \sqrt[3]{x^{2}(3-x)};

(3)

y=x(x−1)23y = \sqrt[3]{x(x-1)^{2}};

(4)

y=x3−4x3y = \sqrt[3]{x^{3}-4 x};

(5)

y=x(x−5)23y = x \sqrt[3]{(x-5)^{2}};

(6)

y=(x+1)3(x−1)23y = (x+1)^{3} \sqrt[3]{(x-1)^{2}};

(7)

y=(1+x)x2/3y = (1+x) x^{2 / 3};

(8)

y=x3(x−1)2/3y = x^{3}(x-1)^{2 / 3};

(9)

y=(x2−4)2/3y = \left(x^{2}-4\right)^{2 / 3};

(10)

y=(x2+8x+12)2/3y = \left(x^{2}+8 x+12\right)^{2 / 3};

(11)

y=x(3−x)23−xy = \sqrt[3]{x(3-x)^{2}}-x;

(12)

y=x23−x2−43y = \sqrt[3]{x^{2}}-\sqrt[3]{x^{2}-4}

Задача 1.21.11

Построить график функции.

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(1)

y=xx2−13y = \frac{x}{\sqrt[3]{x^{2}-1}};

(2)

y=xx+13y = \frac{x}{\sqrt[3]{x+1}}

(3)

y=x(x−2)23y = \frac{x}{\sqrt[3]{(x-2)^{2}}}

(4)

y=x21+x3y = \sqrt[3]{\frac{x^{2}}{1+x}}

(5)

y=(3x−2)2x−13y = \sqrt[3]{\frac{(3 x-2)^{2}}{x-1}}

(6)

y=(x+1x+2)23y = \sqrt[3]{\left(\frac{x+1}{x+2}\right)^{2}}

(7)

y=x23x+2y = \frac{\sqrt[3]{x^{2}}}{x+2};

(8)

y=(x+1)23x2y = \frac{\sqrt[3]{(x+1)^{2}}}{x^{2}}.

Задача 1.21.12

Построить график функции.

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(1)

y=∣x∣1−x2y = \left|x\right| \sqrt{1-x^{2}};

(2)

y=x∣x2−1∣y = x \sqrt{\left|x^{2}-1\right|}

(3)

y=4∣x−1∣x−2y = 4 \frac{\sqrt{\left|x-1\right|}}{x-2};

(4)

y=∣3x2−x3∣y = \sqrt{\left|3 x^{2}-x^{3}\right|};

(5)

y=(x+1)∣x2−1∣y = (x+1) \sqrt{\left|x^{2}-1\right|}

(6)

y=1+∣x−2∣1+∣x∣y = \frac{\sqrt{1+\left|x-2\right|}}{1+\left|x\right|}

(7)

y=(x2−1)x+1y = \left(x^{2}-1\right) \sqrt{x+1};

(8)

y=∣x∣−1x−2y = \frac{\sqrt{\left|x\right|-1}}{x-2}

(9)

y=∣x∣1+3x3y = \left|x\right| \sqrt[3]{1+3 x}

(10)

y=x2∣2−x∣3y = \sqrt[3]{x^{2}\left|2-x\right|}.

Задача 1.21.13

Построить график функции.

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(1)

y=ex−xy = e^{x}-x;

(2)

y=xe−2xy = x e^{-2 x};

(3)

y=x2e−xy = x^{2} e^{-x};

(4)

y=x3e−xy = x^{3} e^{-x};

(5)

y=(x2−2)e−2xy = \left(x^{2}-2\right) e^{-2 x};

(6)

y=(1−x)e3x+1y = (1-x) e^{3 x+1};

(7)

y=e1−x2y = e^{1-x^{2}};

(8)

y=e4x−x2y = e^{4 x-x^{2}};

(9)

y=xe−x2/2y = x e^{-x^{2} / 2};

(10)

y=(x2+2)e−x2y = \left(x^{2}+2\right) e^{-x^{2}};

(11)

y=e−x1−xy = \frac{e^{-x}}{1-x}.

Задача 1.21.14

Построить график функции.

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(1)

y=e(1−x)/(1+x)y = e^{(1-x) /(1+x)};

(2)

y=x2e1/xy = x^{2} e^{1 / x}

(3)

y=(x−2)e−1/xy = (x-2) e^{-1 / x}

(4)

y=x2+2x−3xe1/xy = \frac{x^{2}+2 x-3}{x} e^{1 / x};

(5)

y=xe1/x2y = x e^{1 / x^{2}}.

Задача 1.21.15

Построить график функции.

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(1)

y=ln⁡x−x+1y = \ln x-x+1;

(2)

y=ln⁡xxy = \frac{\ln x}{x};

(3)

y=ln⁡xxy = \frac{\ln x}{\sqrt{x}}

(4)

y=x2ln⁡xy = x^{2} \ln x

(5)

y=xln⁡2xy = x \ln^{2} x

(6)

y=ln⁡2xxy = \frac{\ln^{2} x}{x};

(7)

y=xln⁡xy = \frac{x}{\ln x}

(8)

y=ln⁡∣x−1x+1∣+6x+1y = \ln \left|\frac{x-1}{x+1}\right|+\frac{6}{x+1}

(9)

y=x2−2ln⁡xy = x^{2}-2 \ln x.

Задача 1.21.16

Построить график функции.

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(1)

y=cos⁡x+12sin⁡2xy = \cos x+\frac{1}{2} \sin 2 x;

(2)

y=sin⁡x+12sin⁡2xy = \sin x+\frac{1}{2} \sin 2 x;

(3)

y=sin⁡x−sin⁡2xy = \sin x-\sin^{2} x;

(4)

y=cos⁡x−12cos⁡2xy = \cos x-\frac{1}{2} \cos 2 x;

(5)

y=cos⁡3x+3cos⁡xy = \cos 3 x+3 \cos x.

Задача 1.21.17

Построить график функции.

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(1)

y=sin⁡xsin⁡3xy = \sin x \sin 3 x;

(2)

y=cos⁡xcos⁡2xy = \cos x \cos 2 x;

(3)

y=sin⁡x+12sin⁡2x+13sin⁡3xy = \sin x+\frac{1}{2} \sin 2 x+\frac{1}{3} \sin 3 x.

Задача 1.21.18

Построить график функции.

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(1)

y=cos⁡2xcos⁡xy = \frac{\cos 2 x}{\cos x};

(2)

y=sin⁡(x−π/4)sin⁡xy = \frac{\sin (x-\pi / 4)}{\sin x};

(3)

y=2x−tg⁡xy = 2 x-\operatorname {tg} x.

Задача 1.21.19

Построить график функции.

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(1)

y=x2−arctg⁡xy = \frac{x}{2}-\operatorname {arctg} x;

(2)

y=1arcctg⁡xy = \frac{1}{\operatorname {arcctg} x}

(3)

y=xarctg⁡xy = x \operatorname {arctg} x

(4)

y=x2+2arcctg⁡xy = \frac{x}{2}+2 \operatorname {arcctg} x

(5)

y=32x−arccos⁡1xy = \frac{3}{2} x-\arccos \frac{1}{x}

(6)

y=arcsin⁡2x1+x2y = \arcsin \frac{2 x}{1+x^{2}}

(7)

y=arccos⁡1−x21+x2y = \arccos \frac{1-x^{2}}{1+x^{2}}

(8)

y=x2−arccos⁡2x1+x2y = \frac{x}{2}-\arccos \frac{2 x}{1+x^{2}}.

Задача 1.21.20

Построить график функции.

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(1)

y=ecos⁡xy = e^{\cos x};

(2)

y=e−arctg⁡xy = e^{-\operatorname {arctg} x};

(3)

y=sin⁡x−ln⁡sin⁡xy = \sin x-\ln \sin x;

(4)

y=xxy = x^{x}

(5)

y=(1+x)1/xy = (1+x)^{1 / x}

(6)

y=(1+1/x)xy = (1+1 / x)^{x}.

Задача 1.21.21

Построить графики функций без исследования выпуклости:

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(1)

y=x1/xy = x^{1 / x};

(2)

y=x(1+1/x)x,x>0y = x(1+1 / x)^{x}, x > 0;

(3)

y=cos⁡3x+sin⁡3xy = \cos^{3} x+\sin^{3} x;

(4)

y=sin⁡5x−5sin⁡xy = \sin 5 x-5 \sin x

(5)

y=sin⁡2x2−sin⁡xy = \frac{\sin^{2} x}{2-\sin x};

(6)

y=cos⁡x+cos⁡2x2+cos⁡3x3y = \cos x+\frac{\cos 2 x}{2}+\frac{\cos 3 x}{3};

(7)

y=2ln⁡x−5arctg⁡xy = 2 \ln x-5 \operatorname {arctg} x;

(8)

y=11+x2e1/(1−x2)y = \frac{1}{1+x^{2}} e^{1 /\left(1-x^{2}\right)};

(9)

y=x2x2−4e1/xy = \frac{x^{2}}{x^{2}-4} e^{1 / x}

Задача 1.21.22

Построить график функции y=f(x)y = f(x), заданной параметрическими уравнениями:

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(1)

x=t3+3t+1,y=t3−3t+1x = t^{3}+3 t+1, y = t^{3}-3 t+1;

(2)

x=t3−3π,y=t3−6arctg⁡tx = t^{3}-3 \pi , y = t^{3}-6 \operatorname {arctg} t;

(3)

x=t31+t2,y=t3−2t21+t2x = \frac{t^{3}}{1+t^{2}}, y = \frac{t^{3}-2 t^{2}}{1+t^{2}}

(4)

x=ln⁡sin⁡(t/2),y=ln⁡sin⁡tx = \ln \sin (t / 2), y = \ln \sin t

(5)

x=t−sin⁡t,y=1−cos⁡tx = t-\sin t, y = 1-\cos t (циклоида);

(6)

x=cos⁡t+ln⁡tg⁡(t/2),y=sin⁡tx = \cos t+\ln \operatorname {tg}(t / 2), y = \sin t (трактриса).

Задача 1.21.23

Построить кривую.

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(1)

x=t3+2t2+t,y=−2+3t−t3x = t^{3}+2 t^{2}+t, y = -2+3 t-t^{3}

(2)

x=(t−1)2(t−2),y=(t−1)2(t−3)x = (t-1)^{2}(t-2), y = (t-1)^{2}(t-3);

(3)

x=1t(t+1),y=(t+1)2tx = \frac{1}{t(t+1)}, y = \frac{(t+1)^{2}}{t};

(4)

x=t2t−1,y=t2−1tx = \frac{t^{2}}{t-1}, y = \frac{t^{2}-1}{t};

(5)

x=(t+1)2t,y=t+1t+2x = \frac{(t+1)^{2}}{t}, y = \frac{t+1}{t+2}

(6)

x=t2t2−1,y=t2+1t+2x = \frac{t^{2}}{t^{2}-1}, y = \frac{t^{2}+1}{t+2}

(7)

x=t2+1t,y=t3+1t2x = \frac{t^{2}+1}{t}, y = \frac{t^{3}+1}{t^{2}}.

Задача 1.21.24

Построить кривую.

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(1)

x=t2+6t+53,y=t3−542tx = \frac{t^{2}+6 t+5}{3}, y = \frac{t^{3}-54}{2 t};

(2)

x=t21−2t,y=t31−2tx = \frac{t^{2}}{1-2 t}, y = \frac{t^{3}}{1-2 t};

(3)

x=t21+t3,y=t31+t3x = \frac{t^{2}}{1+t^{3}}, y = \frac{t^{3}}{1+t^{3}};

(4)

x=t3−3t,y=(t−1t)2x = t^{3}-3 t, y = \left(\frac{t-1}{t}\right)^{2};

(5)

x=1t−t2,y=1t−t3x = \frac{1}{t-t^{2}}, y = \frac{1}{t-t^{3}};

(6)

x=1t3−t2,y=1t2−tx = \frac{1}{t^{3}-t^{2}}, y = \frac{1}{t^{2}-t};

(7)

x=1t−t5,y=t41−t4x = \frac{1}{t-t^{5}}, y = \frac{t^{4}}{1-t^{4}}

(8)

x=2t+t31+t4,y=2t−t31+t4x = \sqrt{2} \frac{t+t^{3}}{1+t^{4}}, y = \sqrt{2} \frac{t-t^{3}}{1+t^{4}}.

Задача 1.21.25

Построить кривую.

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(1)

x=et−t,y=e2t−2tx = e^{t}-t, y = e^{2 t}-2 t; 2

(2)

x=tet,y=te−tx = t e^{t}, y = t e^{-t};

(3)

x=(t3−2t2+3t−4)et,y=(t3−2t2+4t−4)etx = \left(t^{3}-2 t^{2}+3 t-4\right) e^{t}, y = \left(t^{3}-2 t^{2}+4 t-4\right) e^{t};

(4)

x=et/t,y=(t−1)2etx = e^{t} / t, y = (t-1)^{2} e^{t}

(5)

x=et/(t+1),y=e−t/(t+1)xx = e^{t} /(t+1), y = e^{-t} /(t+1) x;

(6)

x=2t+ln⁡∣t−1∣,y=t+ln⁡∣t−1∣x = 2 t+\ln \left|t-1\right|, y = t+\ln \left|t-1\right|;

(7)

x=tln⁡t,y=ln⁡ttx = t \ln t, y = \frac{\ln t}{t};

(8)

x=2t2,y=t22−3ln⁡∣t−1t+1∣x = 2 t^{2}, y = \frac{t^{2}}{2}-3 \ln \left|\frac{t-1}{t+1}\right|;

(9)

x=sin⁡t+cos⁡tsin⁡t,y=cos⁡2tsin⁡tx = \frac{\sin t+\cos t}{\sin t}, y = \frac{\cos 2 t}{\sin t};

(10)

x=ctg⁡2t,y=2cos⁡2t−12cos⁡tx = \operatorname {ctg} 2 t, y = \frac{2 \cos 2 t-1}{2 \cos t}

(11)

x=2cos⁡t−cos⁡2t,y=2sin⁡t−sin⁡2tx = 2 \cos t-\cos 2 t, y = 2 \sin t-\sin 2 t;

(12)

x=2cos⁡2t,y=2cos⁡3tx = 2 \cos 2 t, y = 2 \cos 3 t;

(13)

x=sin⁡2t,y=sin⁡3tx = \sin 2 t, y = \sin 3 t;

(14)

x=cos⁡t+tsin⁡t,y=sin⁡t−tcos⁡t,t⩾0x = \cos t+t \sin t, y = \sin t-t \cos t, t \geqslant 0;

(15)

x=etcos⁡t,y=etsin⁡tx = e^{t} \cos t, y = e^{t} \sin t.

Задача 1.21.26

Построить кривую.

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(1)

x3−y3=1x^{3}-y^{3} = 1;

(2)

x4+y4=1x^{4}+y^{4} = 1;

(3)

y2(1−x)=x2(1+x)y^{2}(1-x) = x^{2}(1+x);

(4)

3y2x=x3−23 y^{2} x = x^{3}-2;

(5)

y2=2x3−x4y^{2} = 2 x^{3}-x^{4};

(6)

y2=9(x4−x6)y^{2} = 9\left(x^{4}-x^{6}\right);

(7)

y2x2=4(x−1)y^{2} x^{2} = 4(x-1);

(8)

y2(2−x)=x3y^{2}(2-x) = x^{3};

(9)

y2x4=(x2−1)3y^{2} x^{4} = \left(x^{2}-1\right)^{3};

(10)

y2(x2−1)=x4−4x2y^{2}\left(x^{2}-1\right) = x^{4}-4 x^{2};

(11)

(x−1)(y2−x2/3)=4x2/3(x-1)\left(y^{2}-x^{2} / 3\right) = 4 x^{2} / 3.

Задача 1.21.27

Построить кривую.

?
(1)

(x−y+1)(x+y−1)=1(x-y+1)(x+y-1) = 1;

(2)

(x−2y)2+(4x+2y)2=4(x-2 y)^{2}+(4 x+2 y)^{2} = 4;

(3)

x2y2+y=1x^{2} y^{2}+y = 1;

(4)

xy2+x2y=1x y^{2}+x^{2} y = 1;

(5)

xy(x−y)+x+y=0x y(x-y)+x+y = 0;

(6)

x3+y3=6x2x^{3}+y^{3} = 6 x^{2}.

Задача 1.21.28

Кривую, данную как график уравнения, задать параметрически и построить ее:

?
(1)

x4−y4=4x2yx^{4}-y^{4} = 4 x^{2} y;

(2)

(x+y)3=xy(x+y)^{3} = x y;

(3)

(x+y)4=x2+y2(x+y)^{4} = x^{2}+y^{2};

(4)

x4−2x2y2+y3=0x^{4}-2 x^{2} y^{2}+y^{3} = 0;

(5)

x3−y3+2x−y=0x^{3}-y^{3}+2 x-y = 0;

(6)

(x2−y2)(x−y)=1\left(x^{2}-y^{2}\right)(x-y) = 1;

(7)

x2/3+y2/3=1x^{2 / 3}+y^{2 / 3} = 1;

(8)

x4/3−y4/3=1x^{4 / 3}-y^{4 / 3} = 1.

Задача 1.21.29

Построить кривую, перейдя к полярным координатам:

?
(1)

(x2+y2)x=y\left(x^{2}+y^{2}\right) x = y;

(2)

(x2+y2)2=xy\left(x^{2}+y^{2}\right)^{2} = x y;

(3)

x4+y4=x2+y2x^{4}+y^{4} = x^{2}+y^{2};

(4)

x4+y4=2xyx^{4}+y^{4} = 2 x y;

(5)

x4−y4=xyx^{4}-y^{4} = x y;

(6)

x4−y4=x2−2y2x^{4}-y^{4} = x^{2}-2 y^{2};

(7)

(x2+y2−2x)2=x2+y2\left(x^{2}+y^{2}-2 x\right)^{2} = x^{2}+y^{2};

(8)

(x2+y2−x)2=4(x2+y2)\left(x^{2}+y^{2}-x\right)^{2} = 4\left(x^{2}+y^{2}\right).

Задача 1.21.30

Построить кривую:

?
(1)

x4+y4−6y3+8x2y=0x^{4}+y^{4}-6 y^{3}+8 x^{2} y = 0;

(2)

(x2+y2)3=27x2y2\left(x^{2}+y^{2}\right)^{3} = 27 x^{2} y^{2}

(3)

x4+2y3=4x2yx^{4}+2 y^{3} = 4 x^{2} y;

(4)

(x2−y2)(x−y)=4x2\left(x^{2}-y^{2}\right)(x-y) = 4 x^{2};

(5)

x2y2+y4=4x2x^{2} y^{2}+y^{4} = 4 x^{2};

(6)

x3+y3=x2+y2x^{3}+y^{3} = x^{2}+y^{2};

(7)

x2y2=x3−y3x^{2} y^{2} = x^{3}-y^{3};

(8)

xy=yxx^{y} = y^{x}.

Задача 1.21.31

Построить график функции в полярных координатах:

?
(1)

r=∣sin⁡2φ∣r = \left|\sin 2 \varphi \right|;

(2)

r=cos⁡3φr = \cos 3 \varphi;

(3)

r=tg⁡2φr = \operatorname {tg} 2 \varphi;

(4)

r=1/sin⁡3φr = 1 / \sqrt{\sin 3 \varphi };

(5)

r=2+cos⁡φr = 2+\cos \varphi;

(6)

r=1+cos⁡φr = 1+\cos \varphi;

(7)

r=1+2cos⁡φr = 1+2 \cos \varphi;

(8)

r=1−2cos⁡φr = 1-2 \cos \varphi;

(9)

r=(2/cos⁡φ)−1r = (2 / \cos \varphi )-1;

(10)

r=1+tg⁡φr = 1+\operatorname {tg} \varphi.