$1-2+3-4+5-6+7-8+9-10$

$-2x^2+2x-2$

$\sin\left(\frac{2\pi}{9}\right)\cos\left(\frac{\pi}{18}\right)-\cos\left(\frac{2\pi}{9}\right)\sin\left(\frac{\pi}{18}\right)$

$\int\frac{1}{\left(3x+1\right)\left(x-2\right)}dx$

$\lim_{x\to+\infty}\frac{\sqrt{x^2-3}}{x+2}$

$\left(3x+12\right)\left(3x\right)$

$8b^2-56+89$