$\frac{1-\:sen^2a}{cot\:a}$
$\left(x+4\right)^2\left(x-4\right)^2-2\:\left(x^2-4\right)$
$23,5\cdot7,54$
$\sqrt[2]{36x^2-72xy+36y^2}$
$\frac{2x^3}{x^2+4}$
$\frac{8}{125x^6}-\frac{1000z^9}{64y^{12}}$
$\int k\:f\left(x\right)\:dx$
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