$16x^2-56xy+49y^2$

$\frac{4x^3-5}{3x+2}\:\:x\:\:4$

$\left(10x^2+7x^2\right)\left(10x^2-7x^2\right)$

$2r-5n+9y-3r+n$

$\int\ln\left(5x+1\right)dx$

$\lim_{x\to0}\left(\frac{1}{x}-\left(\frac{2}{\sin\left(2x\right)}\right)\right)$

$\lim_{x\to1}\left(\frac{\ln^2\left(x\right)}{x-1}\right)$