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

Applicare la formula: $ab$$=ab$, dove $ab=2\cdot 2$, $a=2$ e $b=2$

Applicare la formula: $\frac{a}{\frac{b}{c}}$$=\frac{ac}{b}$, dove $a=\sec\left(x\right)^2\tan\left(x\right)$, $b=\cos\left(x\right)^2$, $c=\sin\left(x\right)^{4}$, $a/b/c=\frac{\sec\left(x\right)^2\tan\left(x\right)}{\frac{\cos\left(x\right)^2}{\sin\left(x\right)^{4}}}$ e $b/c=\frac{\cos\left(x\right)^2}{\sin\left(x\right)^{4}}$