Applicare l'identità trigonometrica: $\csc\left(\theta \right)$$=\frac{1}{\sin\left(\theta \right)}$

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

Applicare la formula: $\frac{a}{\frac{b}{c}}$$=\frac{ac}{b}$, dove $a=\csc\left(x\right)^3+4\csc\left(x\right)^2+4$, $b=1+2\sin\left(x\right)$, $c=\sin\left(x\right)$, $a/b/c=\frac{\csc\left(x\right)^3+4\csc\left(x\right)^2+4}{\frac{1+2\sin\left(x\right)}{\sin\left(x\right)}}$ e $b/c=\frac{1+2\sin\left(x\right)}{\sin\left(x\right)}$