$\frac{dx}{dy}=\frac{1}{2x}$
$\sin\left(x\right)^2-1-2\sin\left(x\right)$
$\lim_{x\to3}\left(\frac{x-3}{\sqrt{x-2}-\sqrt{4-x}}\right)$
$100x^2y^2\:-\:9$
$y=-4^{x+2}+5$
$\frac{dy}{dx}+y=\frac{1}{x}$
$\sin\left(4x\right)-sin\left(2x\right)=sin\left(x\right)$
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