$\frac{d^2y}{dx^2}+\frac{2}{x}+\frac{a^2}{y}$
$3\left(2-3x\right)+4\left(-3x+1\right)<0$
$\lim_{x\to0}\left(\frac{tanx\left(cosx-1\right)^2}{x^3}\right)$
$4x+3\frac{x+2}{5}$
$x\:\frac{dy}{dx}+2y\:=\:x^4$
$2tan^{\left(3\right)}x-\:3tan^{\left(2\right)}x\:-\:2tan\:x=\:0$
$1-\tan\left(x\right)+\tan\left(y\right)$
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