$\lim_{y\to0}\left(\frac{2x^3-xy-y^3}{x^2-y^2}\right)$

$\left(\frac{3m^{-1}n^4}{5n^{-4}m^{-3}}\right)^{-2}$

$\left(u^{\frac{4}{5}}+v^{\frac{1}{5}}\right)^5$

$\sin^2\left(\pi x\right)=\sqrt{3}sin\left(\pi x\right)cos\left(\pi x\right)\left|3\le x\le0\right|$

$20\frac{17}{19}\cdot19$

$10u-2u$

$3\left(x+2\right)\left(x+3\right)=60$