$\frac{20a^2xy^2}{-4axy^3}$

$\left(\frac{m}{n^3}\right)^5.\left(\frac{m}{n}\right)^{-3}$

$\lim\:_{x\to\:\infty\:}\left(\frac{3sinx}{2x}\right)$

$\frac{m}{2}=87$

$\lim_{x\to1}\frac{5-\sqrt{3x+28}}{x+1}$

$\int_3^{\infty}4^{\left(2x-4\right)}dx$

$6x\left(6x-y\right)-2-2\left(-y-6x\right)$