$\frac{-15a^4b^7}{45a^2b^2}$

$\lim_{x\to0}\left(\frac{2-\sqrt{2-x}}{x}\right)$

$\left(\sqrt{8}\sqrt{8}\right)$

$5^3\cdot5x$

$\left(2a-y\right)\left(2a+y\right)$

$\frac{dy}{dx}=\left(x^2\cdot y^2\right)$

$\int_{-\frac{\pi}{3}}^{\frac{\pi}{3}}\left(\pi\left(2-x^2\right)-1\right)dx$