6.13 How to simplify with conditions?

For example, to integrate this below, for n positive integer we do

Integrate[Sin[n x]^2, {x, 0, Pi}]	Pi/2 - Sin[2*n*Pi]/(4*n)
Assuming[Element[n, Integers] && n > 0, Integrate[Sin[n x]^2, {x, 0, Pi}]]	Pi/2