$\int_0^4x\:e^xdx$

$\frac{dy}{dt}-2e^t=0$

$\lim_{x\to4}\left(\frac{\sqrt{x-4}}{\sqrt{x^2-16}}\right)$

$\int\frac{\left(4+x^2\right)}{sqrt\left(4-x^2\right)}dx$

$\int_{0.01}^1\left(\frac{\arccos\left(\sqrt{x}\right)}{\sqrt{x}}\right)dx$

$4x\left(-7\right)$

$y^{2\:_{+\:\:}}2y\:+\:1$