$\left(x^3+y^3\right)\left(x^6+x^3y^3+y^6\right)$

$\left(9+8x\right)+\left(7-x\right)\:$

$\left(2t-\frac{3}{t}\right)^2$

$\left(18\:\cdot2500\right)\:+\:\left(24\:\cdot2500\right)$

$\int\frac{x+7}{\left(x-1\right)^2\left(x+8\right)^2}dx$

$\int\left(\frac{4x+1}{x^2-2x}\right)dx$

$\frac{d}{dx}\frac{x}{x+y}=y$