$-5s^2+-s^2+-2s^2$
$\int_0^{\infty}\left(x\cdot\frac{1}{4}\cdot e^{-\frac{x}{4}}\right)dx$
$\lim_{x\to2}\left(\frac{x-2}{\sqrt{2-x}}\right)$
$\int_1^4\:xe^x\:sen^2\:x\:dx$
$a^6-b^4$
$n^2+64=0$
$\frac{dy}{dx}\left(sin4x\right)^{9x}$
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