面积 7cos(7x),7-7cos(7x)

解答

面积

7 cos (7 x), 7 - 7 cos (7 x)

23 + \frac{4 π}{3}

十进制

7.65289 \dots

求解步骤

使用面积公式:

\int_{\frac{π}{21}}^{\frac{5 π}{21}} ∣ 7 cos (7 x) - (7 - 7 cos (7 x)) ∣ d x

解

\int_{\frac{π}{21}}^{\frac{5 π}{21}} ∣ 7 cos (7 x) - (7 - 7 cos (7 x)) ∣ d x : 23 + \frac{4 π}{3}

面积为:

= 23 + \frac{4 π}{3}

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