$\left(\frac{a^{-8}b}{a^{-5}b^3}\right)$

$\lim_{x\to0}\left(\frac{sinx}{sqrt\left(1-cosx\right)}\right)$

$\left(5-2\right)\left(4-7\right)$

$\left(9y^2-8y-6\right)+\left(5y^2+2y-9\right)$

$9x-4\ge12x+9$

$\lim_{x\to-\infty}\left(\sqrt{x^2+x}-\sqrt{x^2-x}\right)$

$\frac{dy}{dx}=2y+x+5$