$\int13sec^4xtan^2xdx$
$\frac{3x^{-2}}{4z^{-1}}$
$\left(4x^3y^3\:+\frac{1}{x}\right)\:dx\:+\:\left(3x^4y^2\:-\frac{1}{y}\right)\:dy\:=\:0$
$\frac{\cot\left(y\right)+\tan\left(y\right)}{\csc\left(y\right)}=\sec\left(y\right)$
$y'=x^3\left(1-y\:\right)$
$3\left(sin2x\right)=1$
$\lim_{x\to0}\left(\frac{e^{x^2}}{2xe^x}\right)$
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