Best method of entry.

[NewMC]

What is the best way to enter the following integral into the Prime?

1/2pi * integral of i(wt) dwt from alpha to beta (this is formula for average current in 1/2-wave, single phase rectifier with inductive load)

Known from i(wt) formula: i(wt)=6.78*sin(wt-0.646)-2.67e^-(wt/0.754)
Given alpha=0.785 and setting wt=beta and i(wt)=0 in above equation I find beta=3.785.

I want to make sure I'm inputting the integral correctly to confirm my answers.

Thank you