$7\cos x+\sqrt{20}=0$

$\lim_{x\to0}\left(\frac{\left(e^{-\left(x\pi\:\:\right)i}\right)\left(\left(-n\pi\right)i\:-\:1\right)\:+\:1}{-2\pi x^2\pi}\right)$

$x-\frac{2}{x-1}=1$

$\lim_{x\to0}\left(\frac{\sin\left(2x\right)}{\sqrt{x+1}-1}\right)$

$\int\frac{\left(x^2-10x-16\right)}{x^2-8x}dx$

$\int\frac{e^{2x}}{\left(1+e^x\right)^{\frac{1}{3}}}dx$

$\left(-2\right)\left(-5\right)\left(-4\right)\left(-10\right)$