$9x^2-18x-36$

$-7z-4+2+3z$

$\int\frac{2x+1}{\left(x^2+1\right)x\left(x+2\right)}dx$

$\int\:\frac{\sqrt{25-\theta\:^2d\theta\:}}{\theta\:^2}$

$\lim_{x\to-\infty}\left(\frac{\left(2x-1\right)}{\sqrt{3x^2+x+1}}\right)$

$\left(-8x^5\right)\left(5x^4\right)$

$\int\left(\frac{1}{129}x^2\right)dx$