$\int\cot^2\left(u\right).\csc\left(u\right)du$
$\left(4x+2\right)\left(x-2\right)$
$\lim_{x\to0}\left(\frac{3}{x}\right)^x$
$\sqrt[3]{8,2^3}$
$\frac{a^7}{a^5}$
$8x^2-32\ge0$
$\frac{1}{\sqrt{\left(n^2+1\right)}-n}$
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