Applicare l'identità trigonometrica: $1-\sin\left(\theta \right)^2$$=\cos\left(\theta \right)^2$

Applicare l'identità trigonometrica: $\cot\left(\theta \right)^n$$=\frac{\cos\left(\theta \right)^n}{\sin\left(\theta \right)^n}$, dove $n=2$

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

Applicare la formula: $\frac{a}{a}$$=1$, dove $a=\cos\left(x\right)^2$ e $a/a=\frac{\cos\left(x\right)^2\sin\left(x\right)^2}{\cos\left(x\right)^2}$