$-\left(-5+3-7+13\right)$
$\int\frac{\mathrm{sech}\left(\sqrt{t}\right)\tanh\left(\sqrt{t}\right)}{\sqrt{t}}dt$
$4x\:+\:3x\:-\:9$
$\frac{4x^0y^{-2}z^3}{4x}$
$\int\frac{1}{y^{12}}dy$
$16+4x^2+25^4$
$\int\left(\frac{x^{2}-6x+9}{x-3}\right)dx$
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