$14kh-2h-11kh$
$3y-2+2y+7-y$
$\frac{3x}{2}+2=x+4$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)}{1+\cos\left(x\right)}\right)$
$\lim\:_{y\to+\infty\:}\left(\frac{2y^2-3y}{y+1}\right)$
$-5x^2y^{-3}$
$y'=1+\frac{1}{y^2}$
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