$\lim_{x\to0}\left(\frac{3x}{\sqrt{9x^2+1}}\right)$
$25v^2-16y^2$
$4x^{2}+3x-9-\left(5x-2\right)$
$\sin\left(x\right)\:\cot\left(x\right)\:=\frac{1}{3}$
$-2x^{2}+4x^{3}-4$
$\left(x^2-2\right)\left(\left|x\right|-2\right)$
$\frac{dy}{dx}=\frac{4x}{3y}$
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