$t^2+t-2$
$6m+14-11+3m$
$5a+2b-3a+2b$
$\frac{d}{dx}x\sqrt{x^2+40}$
$\frac{x^3+\:y\:^3}{x^2+y^2}$
$\frac{1}{e^{-y}}dy=\frac{e^x}{1+e^x}dx$
$\frac{\sin\left(2x\right).\csc\left(x\right)-\cot\left(x\right).\sin\left(x\right)}{\cos\left(x\right)}$
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