Applicare la formula: $a+\frac{b}{c}$$=\frac{b+ac}{c}$, dove $a=\sin\left(x\right)$, $b=\cos\left(x\right)^2$, $c=\sin\left(x\right)$, $a+b/c=\sin\left(x\right)+\frac{\cos\left(x\right)^2}{\sin\left(x\right)}$ e $b/c=\frac{\cos\left(x\right)^2}{\sin\left(x\right)}$

Applicare la formula: $x\cdot x$$=x^2$, dove $x=\sin\left(x\right)$

Applicare la formula: $\sin\left(\theta \right)^2+\cos\left(\theta \right)^2$$=1$

Applicare la formula: $\frac{a}{\frac{b}{c}}$$=\frac{ac}{b}$, dove $a=1$, $b=1$, $c=\sin\left(x\right)$, $a/b/c=\frac{1}{\frac{1}{\sin\left(x\right)}}$ e $b/c=\frac{1}{\sin\left(x\right)}$