∫cos^2(wt+φ)dt

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∫cos^2(wt+φ)dt

∫cos^2(wt+φ)dt
∫cos^2(wt+φ)dt

∫cos^2(wt+φ)dt
∫cos^2(wt+φ)dt=∫(cos(2wt+2φ)+1)/2dt
=t/2+1/2*∫cos(2wt+2φ)dt
=t/2+1/(4w)sin(2wt+2φ)+C,C为任意常数.