# What is the net area between f(x) = sinx and the x-axis over x in [0, 3pi ]?

The net area from 0 to $3 \pi$ would be equal to the area between 0 to $\pi$ which would be
${\int}_{0}^{\pi} \sin x \mathrm{dx}$ = $- {\left[\cos x\right]}_{0}^{\pi}$ = -[-1-1]=2