$\frac{x^{-12}}{\frac{1}{4}y^{-6}}$

$\frac{d}{dx}3^{2x^2}.\sqrt{x}$

$\int_2^{\infty}\left(\frac{4}{x}\right)dx$

$\left(3a^3\:-\:3b^2\right)\left(3a^2\:+\:3b^2\right)$

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

$\frac{sin^3\left(x\right)+cos^3\left(x\right)}{sin\left(x\right)+cos\left(x\right)}=1$

$2y+5x=31$