$2\sec\left(x\right)^2-1$
$3-4\cdot3$
$\frac{dy}{dx}=2x\left(y^2+1\right)$
$a\:+\:3a,\:a\:=\:2$
$\int\frac{1}{\left(x^2-81\right)^{\frac{3}{2}}}dx$
$\left(\frac{3}{9}\right)^{-3}$
$\left(y\:+\:2\right)\:\left(y\:+5\right)$
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