$\lim_{x\to\infty}\left(\frac{cos\left(13x\right)}{13x}\right)$
$n^2-17=-2n$
$\frac{dy}{dx}-\pi y=e$
$w^2+20w+12$
$\int_0^5\left(2^{0.5}e^{\frac{-x}{2}}\right)dx$
$\frac{4x^{3}+2x^{2}}{2x^{2}}$
$\sqrt{x\left(x+7\right)}$
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