Applicare la formula: $\int_{a}^{b} cxdx$$=c\int_{a}^{b} xdx$, dove $a=0$, $b=\pi $, $c=\pi $ e $x=\sin\left(x\right)^2$

Applicare la formula: $\int\sin\left(\theta \right)^2dx$$=\frac{1}{2}\theta -\frac{1}{4}\sin\left(2\theta \right)+C$

Applicare la formula: $\left[x\right]_{a}^{b}$$=eval\left(x,b\right)-eval\left(x,a\right)+C$, dove $a=0$, $b=\pi $ e $x=\frac{1}{2}x-\frac{1}{4}\sin\left(2x\right)$