$\lim_{x\to\infty}\left(\frac{e^x}{x}\right)+\frac{2e^x}{x^2}$
$343x^3-8$
$\left(\sqrt[3]{27}\right)^2;9$
$\int xsec^4x^2dx$
$\frac{1}{9}^{-3}\cdot\frac{4}{5}^1$
$-55gn^2n^3x+110m^2n^3x^2$
$5z^2-2y^3+14+8x^2+9y^3-4z^2-x^2$
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