$\frac{m^3-n^3}{m-n}$
$\int\:3cot\left(x\right).\left(2cot\left(x\right)+5sen\left(x\right)\right)dx$
$x^2-8x+11\le0$
$\lim_{x\to0}\left(\frac{2x-sen\left(x\right)}{x}\right)$
$\left(3\sqrt{a}+5\sqrt{b}\right)\left(3\sqrt{a}-5\sqrt{b}\right)$
$\frac{dy}{dx}=\frac{2y}{x}+1$
$\sin^23ydx+\cos^25xdy$
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