$\int_{-2}^4\frac{x^2+4}{x^2+1}\:dx$

$\lim_{x\to0}-\left(cscx-cotx\right)$

$\left(1-\cos\left(x\right)\right)\sec^2\left(x\right)$

$\frac{3}{x+4}+\frac{x^2-7x+28}{x^2-16}+\frac{2}{x-4}$

$\frac{2}{32}.\frac{32}{4}.\frac{4}{2}+42.\:\frac{5}{7}$

$x^2\frac{dy}{dx}=1$

$\left(2x+5\:\right)\left(2x-5\:\right)$