$\left(-4x+2y+3\right)\left(2x+3y+2\right)$
$\frac{3x^2+4x+5}{x+5}$
$\lim_{x\to0}\left(\frac{\ln\left(2x+1\right)}{x+1}\right)$
$2\left(x+3\right)+6\left(x-5\right)=72$
$4\cos^2\left(2x\right)+4\sin^2\left(2x\right)+9$
$z\:=\:2xy$
$\frac{1}{3}x+8x^4-\frac{2}{3}x^2-x$
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