$g\left(x\right)=\left(x-y\right)\left(x^2+y^2\right)$

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

$8\frac{3}{4}\:\:\:8\frac{7}{8}$

$\left(x^3y+9xy^2z\right)^2$

$a+7+3b+3a-2b$

$\int-9x\cdot\sin\left(10x\right)$

$\frac{d}{dx}\left(arctan\left(4e^{-7x}\right)\right)$