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

$\frac{1}{1+4y^2}\frac{dy}{dx}-e^x=0$

$2xy^2=3$

$\left(x-\frac{1}{4}\right)\left(x+\frac{3}{4}\right)$

$\left(3a+5\right)\left(3a-10\right)$

$\frac{1+\sin e}{\cos e}+\frac{\cos e}{1+\sin e}\:=2\sec e$

$3\left(2^2\right)-2\left(3\right)+4$