$-\left|-\left(a-2b\right)-\left(a+2b\right)-\left(-a-3b\right)\right|$

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

$20x^2+46x+12$

$\left(-7\right).\left|\left(-3\right)+\left(+6\right)\right|$

$-38+6+27\left(-8\right)+126$

$\frac{dy}{dx}=\frac{\left(xy+2y-x-2\right)}{\left(xy+3y+x-3\right)}$

$10\left(\sqrt{x}\right)^2\left(-2\right)^3$