Applicare la formula: $\left(a+b\right)\left(a+c\right)$$=a^2-b^2$, dove $a=1$, $b=\cot\left(x\right)$, $c=-\cot\left(x\right)$, $a+c=1-\cot\left(x\right)$ e $a+b=1+\cot\left(x\right)$
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