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

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