$\left(9m^4-2p^2\right)\left(9m^4+2p^2\right)$

$\lim_{x\to3}\left(\frac{-4.9x^2+44.1}{x-3}\right)$

$\frac{6z}{2y^2}$

$\int\left(\frac{4x^2+3}{\left(x-5\right)^3}\right)dx$

$\left(9x^3-3x+4\right)\cdot\:\left(-\frac{5}{4}x^4\right)$

$\lim_{x\to0}\left(\frac{x^2e^2}{cos\:x-1}\right)$

$3a^2b-21ab-54b$