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Find the rms value of current i=I(m)sin ...

Find the rms value of current `i=I_(m)sin omegat` from `(i) t=0 "to" t=(pi)/(omega)` (ii) `t=(pi)/(2omega) "to" t=(3pi)/(2omega)`

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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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