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integral of 5/(x^2)sin^2(-5/x)

解答

\int \frac{5}{x ^{2}} sin^{2} (- \frac{5}{x}) d x

解答

\frac{5}{2} (- \frac{1}{x} + \frac{1}{10} sin (\frac{10}{x})) + C

求解步骤

\int \frac{5}{x ^{2}} sin^{2} (- \frac{5}{x}) d x

提出常数:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 5 \cdot \int \frac{1}{x ^{2}} sin^{2} (- \frac{5}{x}) d x

化简

\frac{1}{x ^{2}} sin^{2} (- \frac{5}{x}) : \frac{sin ^{2} ( \frac{5}{x} )}{x ^{2}}

= 5 \cdot \int \frac{sin ^{2} ( \frac{5}{x} )}{x ^{2}} d x

使用三角恒等式改写

= 5 \cdot \int \frac{1 - cos ( \frac{10}{x} )}{2 x ^{2}} d x

提出常数:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 5 \cdot \frac{1}{2} \cdot \int \frac{1 - cos ( \frac{10}{x} )}{x ^{2}} d x

乘开

\frac{1 - cos ( \frac{10}{x} )}{x ^{2}} : \frac{1}{x ^{2}} - \frac{cos ( \frac{10}{x} )}{x ^{2}}

= 5 \cdot \frac{1}{2} \cdot \int \frac{1}{x ^{2}} - \frac{cos ( \frac{10}{x} )}{x ^{2}} d x

使用积分加法定则:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 5 \cdot \frac{1}{2} (\int \frac{1}{x ^{2}} d x - \int \frac{cos ( \frac{10}{x} )}{x ^{2}} d x)

\int \frac{1}{x ^{2}} d x = - \frac{1}{x}

\int \frac{cos ( \frac{10}{x} )}{x ^{2}} d x = - \frac{1}{10} sin (\frac{10}{x})

= 5 \cdot \frac{1}{2} (- \frac{1}{x} - (- \frac{1}{10} sin (\frac{10}{x})))

化简

5 \cdot \frac{1}{2} (- \frac{1}{x} - (- \frac{1}{10} sin (\frac{10}{x}))) : \frac{5}{2} (- \frac{1}{x} + \frac{1}{10} sin (\frac{10}{x}))

= \frac{5}{2} (- \frac{1}{x} + \frac{1}{10} sin (\frac{10}{x}))

解答补常数

= \frac{5}{2} (- \frac{1}{x} + \frac{1}{10} sin (\frac{10}{x})) + C

作图

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