$20+4$
$\frac{x}{x^2}+2$
$2\sqrt{-7}\cdot3\sqrt{-28}$
$sen^2x\:+sec\:^2x\:-tan^2x\:+1$
$a^2+9a+20;\:a=2$
$\int\left(\frac{1-x}{\sqrt{\left(1-x\right)^2}}\right)dx$
$\frac{dy}{dx}\left(sin\left(x\right)\:-\:sin\left(y\right)\:=\:sin\left(x-y\right)\right)$
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