Applying the trigonometric identity: $\cot\left(\theta \right) = \frac{\cos\left(\theta \right)}{\sin\left(\theta \right)}$

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

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