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受欢迎的微积分 >

integral of 2^{sin^2(1/3 x)}sin(2/3 x)

解答

\int 2^{s i n^{2} (\frac{1}{3} x)} sin (\frac{2}{3} x) d x

解答

\frac{3 \cdot 2 ^{s i n^{2} (\frac{x}{3})}}{ln ( 2 )} + C

求解步骤

\int 2^{s i n^{2} (\frac{1}{3} x)} sin (\frac{2}{3} x) d x

使用换元积分法

= \int 3 \cdot 2^{s i n^{2} (u)} sin (2 u) d u

提出常数:

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

= 3 \cdot \int 2^{s i n^{2} (u)} sin (2 u) d u

使用换元积分法

= 3 \cdot \int 2^{v} d v

\int a^{x} d x = \frac{a ^{x}}{ln a}

= 3 \cdot \frac{2 ^{v}}{ln ( 2 )}

代回

= 3 \cdot \frac{2 ^{s i n^{2} (\frac{1}{3} x)}}{ln ( 2 )}

化简

3 \cdot \frac{2 ^{s i n^{2} (\frac{1}{3} x)}}{ln ( 2 )} : \frac{3 \cdot 2 ^{s i n^{2} (\frac{x}{3})}}{ln ( 2 )}

= \frac{3 \cdot 2 ^{s i n^{2} (\frac{x}{3})}}{ln ( 2 )}

解答补常数

= \frac{3 \cdot 2 ^{s i n^{2} (\frac{x}{3})}}{ln ( 2 )} + C

作图

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