$3\left(2-5\right)+2\left(-3-1\right)$
$\cot^2\left(x\right)+\csc\left(x\right)$
$\left(7a+8\right)\left(7a-8\right)$
$sen^4x-cos^4x=0,\:5$
$\left(8x^2-5\right)\left(8x^2+5\right)$
$\left(\frac{\left(x+2\right)\left(\sqrt{1-x^2}\right)}{4x^3}\right)$
$\int\frac{x^2+9x+2}{\left(x^2+3\right)\left(x^2+5\right)}dx$
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