$-9+n=15$
$\lim_{x\to\infty}\left(\frac{-e^{-x}}{cosx}\right)$
$5x^2+7x-3x^2-10x$
$\int\sqrt[4]{x+3}dx$
$\frac{-17x^{3}z^{4}+36xz^{2}}{-4x^{3}z^{4}}$
$\frac{dy}{dx}=40yx^3,\:y=6$
$\left(a-5\right)\left(a+5\right)-\left(a-5\right)^2$
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