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You need to calculate the following integral
which comes from formula for expected value.
`170int_0^pi x/(120pi)sin x dx/(120pi)=170/(120^2pi^2)int_0^pi x sin x dx=`
`|(u=x,dv=sin x dx),(du=dx,v=-cosx)|`
` `The average voltage over half cycle time interval `[0,1/120]` is `17/(1440pi)`
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