$\frac{dx}{dy}y=\left(x+1\right)\left(y^2+1\right)$
$\frac{d}{dx}\left(\frac{y}{x-y}-x^3-1\right)$
$\log_{14}\left(xe^x\right)$
$tga\:+\:tgb\:=\:\frac{sin\left(a+b\right)}{cosa\:cosb}$
$\left(x-y\right)\left(x^2+y+y^2\right)$
$\cos\left(\left(90-a\right)-b\right)$
$\lim_{x\to0}\left(\frac{\left(x+2\right)^2-8}{x}\right)$
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