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受欢迎的微积分 >

integral of x/(36+4x^4)

解答

\int \frac{x}{36 + 4 x ^{4}} d x

解答

\frac{1}{24} arctan (\frac{x ^{2}}{3}) + C

求解步骤

\int \frac{x}{36 + 4 x ^{4}} d x

使用换元积分法

= \int \frac{1}{2 ( 36 + 4 u ^{2} )} d u

提出常数:

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

= \frac{1}{2} \cdot \int \frac{1}{36 + 4 u ^{2}} d u

使用换元积分法

= \frac{1}{2} \cdot \int \frac{1}{12 ( v ^{2} + 1 )} d v

提出常数:

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

= \frac{1}{2} \cdot \frac{1}{12} \cdot \int \frac{1}{v ^{2} + 1} d v

使用积分常见定则:

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

= \frac{1}{2} \cdot \frac{1}{12} arctan (v)

代回

= \frac{1}{2} \cdot \frac{1}{12} arctan (\frac{2}{6} x^{2})

化简

\frac{1}{2} \cdot \frac{1}{12} arctan (\frac{2}{6} x^{2}) : \frac{1}{24} arctan (\frac{x ^{2}}{3})

= \frac{1}{24} arctan (\frac{x ^{2}}{3})

解答补常数

= \frac{1}{24} arctan (\frac{x ^{2}}{3}) + C

作图

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