$\frac{4-2x}{\left(x^{2}+2\right)}\leq2-\frac{x}{x-3}$

$\left(4x+4\right)\left(x-5\right)$

$\int\left(2s-3\right)^2\left(1-4s^{-1}\right)^2ds$

$\int\frac{9x+18}{x\left(x+3\right)^2}dx$

$\int tanx\cdot sec^{\frac{5}{2}}xdx$

$\left(a+b\sqrt{-1}\right)^4$

$y^{2\:_{+\:\:}}2y\:+\:1$