$3n\:+n$
$\left(5x^2+x+3\right)+\left(9x^2-1\right)$
$\left(x^{a+1}-1x^{a-n}\right)^2$
$\frac{dy}{dx}=xy+x+t+1$
$sen^2\left(0\right)$
$\int\frac{1}{x-h\cdot\sqrt{x}}dx$
$\frac{d^2}{dx^2}\left(\sqrt{\left(a^2+x^2\right)}\right)$
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