Applicare la formula: $a\ln\left(x\right)$$=-\ln\left(x^{\left|a\right|}\right)$, dove $a=-2$

Applicare la formula: $\ln\left(a\right)-\ln\left(b\right)$$=\ln\left(\frac{a}{b}\right)$, dove $a=\cot\left(x\right)$ e $b=x^{2}$

Applicare la formula: $a\ln\left(x\right)$$=-\ln\left(x^{\left|a\right|}\right)$, dove $a=-7$ e $x=3-x$

Applicare la formula: $\ln\left(a\right)-\ln\left(b\right)$$=\ln\left(\frac{a}{b}\right)$, dove $a=\frac{\cot\left(x\right)}{x^{2}}$ e $b=\left(3-x\right)^{7}$

Applicare la formula: $\frac{\frac{a}{b}}{c}$$=\frac{a}{bc}$, dove $a=\cot\left(x\right)$, $b=x^{2}$, $c=\left(3-x\right)^{7}$, $a/b/c=\frac{\frac{\cot\left(x\right)}{x^{2}}}{\left(3-x\right)^{7}}$ e $a/b=\frac{\cot\left(x\right)}{x^{2}}$