$5a^2-10b+9b$

$\frac{\sin^2\left(x\right)-16\sin\left(x\right)+64}{\sin\left(x\right)\cos\left(x\right)-8\cos\left(x\right)}$

$\int_{\pi}^{2\pi}\frac{x^2}{sen\left(x^3\right)}dx$

$5x^4y+20x^3y+20x^2y$

$\lim_{x\to7}\:\frac{x+10}{x^2-49}$

$-16+12-4+8-7+31-19-23$

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