integral of (x-2)/(sqrt(9-x^2))

解答

\int \frac{x - 2}{9 - x ^{2}} d x

- 9 - x^{2} - 2 arcsin (\frac{1}{3} x) + C

求解步骤

\int \frac{x - 2}{9 - x ^{2}} d x

乘开

\frac{x - 2}{9 - x ^{2}} : \frac{x}{9 - x ^{2}} - \frac{2}{9 - x ^{2}}

= \int \frac{x}{9 - x ^{2}} - \frac{2}{9 - 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

= \int \frac{x}{9 - x ^{2}} d x - \int \frac{2}{9 - x ^{2}} d x

\int \frac{x}{9 - x ^{2}} d x = - 9 - x^{2}

\int \frac{2}{9 - x ^{2}} d x = 2 arcsin (\frac{1}{3} x)

= - 9 - x^{2} - 2 arcsin (\frac{1}{3} x)

解答补常数

= - 9 - x^{2} - 2 arcsin (\frac{1}{3} x) + C

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