$\int_0^5\left(e^{-2t}\right)dx$
$\left(x+20\:\right)\left(x-20\right)$
$\int\left(x^3+x^{-2}\right)dx$
$\sin^2x+\cos\left(2x\right)=\cos^2x$
$x^4-3x^3-x^2-27x-90$
$\left(-2\right).4+5-3.\left(-1\right)$
$\lim_{x\to2}\left(\frac{x^2-5}{x-2}\right)$
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