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受欢迎的微积分 >

integral of (x+2)/(x^2+3x+4)

解答

\int \frac{x + 2}{x ^{2} + 3 x + 4} d x

解答

\frac{1}{2} ln 4 x^{2} + 12 x + 16 + \frac{1}{7} arctan (\frac{2 x + 3}{7}) + C

求解步骤

\int \frac{x + 2}{x ^{2} + 3 x + 4} d x

对

x^{2} + 3 x + 4

配方:

(x + \frac{3}{2})^{2} + \frac{7}{4}

= \int \frac{x + 2}{( x + \frac{3}{2} ) ^{2} + \frac{7}{4}} d x

使用换元积分法

= \int \frac{2 ( 2 u + 1 )}{4 u ^{2} + 7} d u

提出常数:

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

= 2 \cdot \int \frac{2 u + 1}{4 u ^{2} + 7} d u

乘开

\frac{2 u + 1}{4 u ^{2} + 7} : \frac{2 u}{4 u ^{2} + 7} + \frac{1}{4 u ^{2} + 7}

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

= 2 (\int \frac{2 u}{4 u ^{2} + 7} d u + \int \frac{1}{4 u ^{2} + 7} d u)

\int \frac{2 u}{4 u ^{2} + 7} d u = \frac{1}{4} ln 4 u^{2} + 7

\int \frac{1}{4 u ^{2} + 7} d u = \frac{1}{2 7} arctan (\frac{2}{7} u)

= 2 (\frac{1}{4} ln 4 u^{2} + 7 + \frac{1}{2 7} arctan (\frac{2}{7} u))

u = x + \frac{3}{2}

代回

= 2 (\frac{1}{4} ln 4 (x + \frac{3}{2})^{2} + 7 + \frac{1}{2 7} arctan (\frac{2}{7} (x + \frac{3}{2})))

化简

2 (\frac{1}{4} ln 4 (x + \frac{3}{2})^{2} + 7 + \frac{1}{2 7} arctan (\frac{2}{7} (x + \frac{3}{2}))) : \frac{1}{2} ln 4 x^{2} + 12 x + 16 + \frac{1}{7} arctan (\frac{2 x + 3}{7})

= \frac{1}{2} ln 4 x^{2} + 12 x + 16 + \frac{1}{7} arctan (\frac{2 x + 3}{7})

解答补常数

= \frac{1}{2} ln 4 x^{2} + 12 x + 16 + \frac{1}{7} arctan (\frac{2 x + 3}{7}) + C

作图

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