$\left(-\infty-1\right)e^{-\infty}$

$+2x^2-x^2$

$\frac{\left(x^{\frac{1}{5}}y^{\frac{3}{2}}\right)^{10}}{\left(y^{\left(-1\right)\cdot\frac{2}{5}}x^{\frac{2}{3}}\right)^5}$

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

$\sin\left(2x\right)-\tan\left(x\right)\cos\left(x\right)=\tan\left(x\right)$

$19xz^3+2xz^2-xz^3-11xz^2$