$\int\:\frac{x}{\sqrt{x+12}}\:dx$
$4e^{-2x}-4e^{-x}$
$3xy+2x+5x^2y$
$\frac{d^2}{dx^2}\left(x^2+2y^2=2\right)$
$\int e^{9x+1}dx$
$7x\:+\:2\:-\:x\:-\:2$
$7-\left(32-45\right)-56+\left(12-45\right)$
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