$\left(x+y+3\right)\left(x+y+4\right)$

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

$\frac{10\sin\left(x\right)^2-7\cos\left(x\right)+2}{3+2\cos\left(x\right)}$

$4x^2+6x^2-11x^2$

$\lim_{x\to3}\left(\frac{x^2-9}{1-\sqrt{\left(x-2\right)}}\right)$

$9z^4-100z^5$

$\frac{dy}{dx}=\left(1+e^x\right)^{-1}$