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The average value of current i=I(m) sin ...

The average value of current `i=I_(m) sin omega t from t=(pi)/(2 omega )` to `t=(3 pi)/(2 omega)` si how many times of `(I_m)`?

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`ltigt =(underset(0)overset(pi/omega)int I_(m) sin omegat dt)/(pi/omega)=(I_(m)/omega(1-cosomega pi/omega))/(pi/omega)=(2I_(m))/pi` , (ii) `ltigt =(underset(pi/(2omega))overset((3pi)/(2omega))intI_(m)sin omegatdt)/(pi/omega)=0`.
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