$r _ { x } ^ { 0 }$

$\frac{x^3+8x^2+9x}{x+3}$

$+1\left(n\right)^{3}+3\left(n\right)^{2}\left(3\right)+3\left(n\right)\left(3\right)^{2}$

$\int\left(x+3\right)^3\cdot\:ln\left(x-3\right)\:dx$

$\int8cos\left(x\right)sin^6\left(x\right)dx$

$\int_1^3\pi\left(2x+3\right)^2dx$

$x+y;x=0,y=1$