$\int_{500}^{700}\left(900+6x-0.002x^2\right)dx$

$2\csc^2x-3\cot x=1$

$\frac{d}{dx}\left(5x^3-3x\right)$

$\frac{216+125w^3}{4+5y}$

$\int xe^{-8x^2}dx$

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

$-\frac{1}{3}ab-\frac{1}{5}ab-\frac{1}{2ab}-\frac{1}{12}ab-7ab-1$