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受欢迎的微积分 >

integral from 0 to 2 of-sqrt(5-x^2)

解答

\int_{0}^{2} - 5 - x^{2} d x

解答

- \frac{5 ( 2 arcsin ( \frac{2}{5} ) + sin ( 2 arcsin ( \frac{2}{5} ) ) )}{4}

+1

十进制

- 3.76787 \dots

求解步骤

\int_{0}^{2} - 5 - x^{2} d x

提出常数:

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

= - \int_{0}^{2} 5 - x^{2} d x

使用三角换元法

= - \int_{0}^{a r c s i n (\frac{2}{5})} 5 cos^{2} (u) d u

提出常数:

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

= - 5 \cdot \int_{0}^{a r c s i n (\frac{2}{5})} cos^{2} (u) d u

使用三角恒等式改写

= - 5 \cdot \int_{0}^{a r c s i n (\frac{2}{5})} \frac{1 + cos ( 2 u )}{2} d u

提出常数:

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

= - 5 \cdot \frac{1}{2} \cdot \int_{0}^{a r c s i n (\frac{2}{5})} 1 + cos (2 u) d u

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

= - 5 \cdot \frac{1}{2} (\int_{0}^{a r c s i n (\frac{2}{5})} 1 d u + \int_{0}^{a r c s i n (\frac{2}{5})} cos (2 u) d u)

\int_{0}^{a r c s i n (\frac{2}{5})} 1 d u = arcsin (\frac{2}{5})

\int_{0}^{a r c s i n (\frac{2}{5})} cos (2 u) d u = \frac{sin ( 2 arcsin ( \frac{2}{5} ) )}{2}

= - 5 \cdot \frac{1}{2} arcsin (\frac{2}{5}) + \frac{sin ( 2 arcsin ( \frac{2}{5} ) )}{2}

化简

- 5 \cdot \frac{1}{2} arcsin (\frac{2}{5}) + \frac{sin ( 2 arcsin ( \frac{2}{5} ) )}{2} : - \frac{5 ( 2 arcsin ( \frac{2}{5} ) + sin ( 2 arcsin ( \frac{2}{5} ) ) )}{4}

= - \frac{5 ( 2 arcsin ( \frac{2}{5} ) + sin ( 2 arcsin ( \frac{2}{5} ) ) )}{4}

作图

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