$\int\left(e^{3x}\left(6+e^{3x}\right)^6\right)dx$

$x ^ { 2 } y - 2 y = x ^ { 3 } - 1$

$-3x+2y=6$

$\int_0^{\frac{\pi\:}{8}}\left(\left(cos7x\right)^2sen7x\right)dx$

$\left(x+1\right)\left(x^5+3x^4-7x^3+2x^2-8x+1\right)$

$7-3x=x-4\left(2+x\right)$

$\int\:\:x^3e^{-2x}dx$