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受欢迎的微积分 >

integral of (2x-3)/(x^2+2x+2)

解答

\int \frac{2 x - 3}{x ^{2} + 2 x + 2} d x

解答

ln x^{2} + 2 x + 2 - 5 arctan (x + 1) + C

求解步骤

\int \frac{2 x - 3}{x ^{2} + 2 x + 2} d x

对

x^{2} + 2 x + 2

配方:

(x + 1)^{2} + 1

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

使用换元积分法

= \int \frac{2 u - 5}{u ^{2} + 1} d u

乘开

\frac{2 u - 5}{u ^{2} + 1} : \frac{2 u}{u ^{2} + 1} - \frac{5}{u ^{2} + 1}

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{2 u}{u ^{2} + 1} d u - \int \frac{5}{u ^{2} + 1} d u

\int \frac{2 u}{u ^{2} + 1} d u = ln u^{2} + 1

\int \frac{5}{u ^{2} + 1} d u = 5 arctan (u)

= ln u^{2} + 1 - 5 arctan (u)

u = x + 1

代回

= ln (x + 1)^{2} + 1 - 5 arctan (x + 1)

乘开

(x + 1)^{2} + 1 : x^{2} + 2 x + 2

= ln x^{2} + 2 x + 2 - 5 arctan (x + 1)

解答补常数

= ln x^{2} + 2 x + 2 - 5 arctan (x + 1) + C

作图

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