(cosx)^5dx
=∫(cosx)^4dsinx
=∫[(cosx)^2]^2dsinx
=∫[1-(sinx)^2]^2dsinx
=∫[1-2(sinx)^2+(sinx)^4]dsinx
=sinx-2/3*(sinx)^3+(sinx)^5/5
代入积分上下限
sinx-2/3*(sinx)^3+(sinx)^5/5【-π/2,π/2】=16/15
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