$\int_0^{\infty\:}\:t^2e^{\frac{-t}{\tau\:}}dt$
$15-\left(+3-8\right)$
$\sin\left(x\right)\cdot\cos\left(x\right)\cdot\cot\left(x\right)-1$
$12-19-\left(12-8\right)+\left(-4\right)$
$x^2y\:+\:2xy\:=\:ln\left(x\right)\:$
$\frac{x^4+x^2+2x+15}{x^2-3x+2}$
$m^2-16m\:+63$
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