$\frac{4-x^2}{x}$
$x^4+4x^3-10x^2-28x-15$
$\frac{dy}{dx}\:=\:\frac{6x^2}{y^2}$
$36x^3-\left(6x^3-2\right)^2$
$4b-6$
$\frac{dy}{dx}\left(4\cos\left(x\right)\sin\left(y\right)=1\right)$
$\lim_{x\to3}\left(\frac{1-cos\left(5x\right)}{25x^2}\right)$
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