$\lim_{x\to0}\left(\frac{x^2+7x}{x+e^x}\right)$

$\frac{dy}{dx}\left(x^3e^{-2x}\right)$

$\lim_{n\to\infty}\left(-2^n\right)$

$\int\left(1-cosp\left(pka\right)\right)\cdot\cos\left(rka\right)dk$

$\lim\:_{x\to\:4}\left(\frac{\sqrt{1+x}-\:\sqrt{5}}{x\:-\:4}\right)$

$3m^2+7m-6$

$x^2-17x+70$