$\left(x+\left(y^{2\:}-xy\right)^{\frac{1}{2}}\right)\frac{dy}{dx}$

$a\log b+b\log a$

$\left(7x-2\right)\left(x-5\right)$

$\frac { i } { i }$

$\lim_{x\to7}\left(\frac{49-x^2}{\sqrt{9-x\:\:-\:\sqrt{2}}}\right)$

$4x^2\:+\:\:40x\:+\:49$

$\left|\left(x-a\right)+3\right|\left|\left(x-a\right)+3\right|$