$x\frac{dy}{dx}-y=2x^2y$
$10x-3x+10x$
$\left(y-18\right)\left(y+13\right)$
$3x+2y-x-x-y$
$\lim_{x\to1}\left(\frac{5-x^2}{sen\left(\pi x\right)}\right)$
$\left(tan\:x\:-\:cot\:x\right)\left(3\:tan^2\:x\:+3\:cot^2\:x\:+3\right)$
$x\cdot\tan^{-1}\left(2x\right)-\frac{1}{4}\left(1+4x^2\right)$
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