$\frac{3}{5}x^2-\frac{1}{3}xy-3xz+\frac{8}{3}xz+\frac{5}{2}x^3$

$\left(2+\sqrt{y}\right)\left(2-\sqrt{y}\right)x$

$-a+b-c+8+2a+2b-19-2c-3a-3-3b$

$30-2\cdot10+5\cdot2$

$\left(-s\right)\left(-\frac{2}{s-1}\right)$

$2x+1\:+\:2x-1\:are$

$\int\cos\left(9x^3+8\right).x^2dx$