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数学
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请帮我做一道微积分的题
求定积分 ∫(sin(wt+φ))^2 dt的值 ,其中t的上界是T(即一个周期),下界是0.
人气:119 ℃ 时间:2020-04-04 04:27:18
解答
∫(sin(wt+φ))^2 dt
=∫0.5(1-cos(2wt+2φ)) dt
=0.5T-∫cos(2wt+2φ) dt
而cosx在整数个周期内的积分为0
所以原式=0.5T
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