$4x^2+4xy+x$

$7x\cdot4x$

$\frac{d}{dx}\left(\frac{\sqrt{x+4}}{\left(2x+3\right)^3}\right)$

$\frac{d}{dx}\left(\left(\frac{\sqrt{x-1}}{\sqrt{x^4+2}}\right)\right)$

$\:log\left(x\right)+log\left(x+2\right)=8$

$49m^2-144n^2$

$y-3=\frac{1}{6}\left(x-\left(-8\right)\right)$