$\int\frac{e^x}{x}.xdx$

$\frac{x-2}{x-3}-\frac{x-3}{x-4}$

$4\left(1-5\right)-\left(4-5\right)$

$\int\:\:\:6x\left(-x^2+5\right)^7dx$

$\left(\frac{1}{1-\sin^2\left(a\right)}\right)-\left(\tan\left(a\right)\frac{1}{\cot\left(a\right)}\right)$

$\frac{dy}{dx}=x^2+\frac{2y}{x}$

$4x\:+\:4-3x\:+\:2$