$2x-2y$
$\int xe^{-3}dx$
$\frac{\tan^2x}{1-\sec x}=\frac{\tan x}{\cot x+\csc x}$
$\int x^2e^{\frac{2x}{3}}dx$
$\frac{x^2-2x+3}{x+1}$
$-3+5\left(-4+2\right)-6-3\cdot\left(2-4\right)$
$\int\:\frac{8x+1}{\sqrt{16-x^2}}dx$
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