Applicare l'identità trigonometrica: $\tan\left(\theta \right)$$=\frac{\sin\left(\theta \right)}{\cos\left(\theta \right)}$

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

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