$\frac{-4x-5}{2}\cdot10$
$\frac{x^3-2x^2-4}{x^3+2x^2}$
$2d^2-4dk+2k^2$
$y^2-8y+7$
$tan\left(3x\right)=\frac{3\tan\:\left(x\right)-\tan\:^3\left(x\right)}{1-3\tan\:2\left(x\right)}$
$3e^xtany\:dx+\left(2-e^x\right)sec^2y\:dy=0$
$\int_0^{\infty}\left(\frac{1}{x^2+1}-\frac{1}{\frac{3}{3x+1}}\right)dx$
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