$\frac{d}{dx}\:\frac{3x^2}{e^{2x}}$

$\frac{2x^2-3}{x^3+3x^2+3x+1}$

$7p+6q_{-2p+q}$

$\int_{-\sqrt{9-x^2}}^{\sqrt{9-x^2}}\left(3y^2\:+\:3x^2\right)dy$

$\int_1^2\pi\:\left(\frac{1}{x^2}-\frac{1}{4}\right)dx$

$\left(a^2+b-1\right)\left(a^2+b-1\right)$

$\lim_{x\to0}\left(\frac{x}{5^x-3^x}\right)$