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slavaekb
@slavaekb
July 2022
1
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1)найти объем тела образованного вращением вокруг оси ох фигуры, ограниченной кривыми y=x^2/2 ,2x+y=0
2)вычислить интеграл (x√x +3 sin 3x)dx
√ это корень
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Gerren
y=x^2/2 ,2x+y=0 y=-2x
x^2/2=-2x
x^2+4x=0
x=0 x=-4
V=pi
∫a,bf(x)^2-pi∫a,bg(x)^2
∫(x^2/2)^2dx=x^5/20
∫(-2x)^2dx=4x^3/3
V=pi(0-(-4)^5/20)-(0-4*(-4)^3/3))=pi(4096/20-256/3)=pi(1024/5-256/3)=pi(3072-1280)/15=1792pi/15
2)∫
(x√x +3 sin 3x)dx=
∫x^(3/2)+3∫sin3x=2x^(5/2)/5-cos3x+C
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Answers & Comments
x^2/2=-2x
x^2+4x=0
x=0 x=-4
V=pi∫a,bf(x)^2-pi∫a,bg(x)^2
∫(x^2/2)^2dx=x^5/20
∫(-2x)^2dx=4x^3/3
V=pi(0-(-4)^5/20)-(0-4*(-4)^3/3))=pi(4096/20-256/3)=pi(1024/5-256/3)=pi(3072-1280)/15=1792pi/15
2)∫ (x√x +3 sin 3x)dx=∫x^(3/2)+3∫sin3x=2x^(5/2)/5-cos3x+C