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

Applicare la formula: $1x$$=x$, dove $x=\sin\left(x\right)$

Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=x^2x$, $x^n=x^2$ e $n=2$

Applicare la formula: $a+b$$=a+b$, dove $a=2$, $b=1$ e $a+b=2+1$

Applicare la formula: $a\frac{b}{c}$$=\frac{ba}{c}$, dove $a=_l$, $b=\sin\left(x\right)$ e $c=x^{3}$