$-\frac{800}{-20}$

$\int5x^2\sqrt{8-x^2}dx$

$\int x^{\frac{9}{2}}\:cos\left(x^{\frac{11}{2}}\right)\:dx$

$\frac{x^2\left(x^2-9\right)}{x\left(x+3\right)}$

$\lim_{x\to1}\left(\frac{1-x+ln\left(x\right)}{1-cos\left(8\pi x\right)}\right)$

$\left(-3-6\right)^2-8$

$16x^2-2x^3y^2+\frac{y^4}{16}$