$16x^4y^2+56x^3y+49x^2$
$\frac{32a^3b^2}{8a^5b}$
$x^2+5x+19;x=-3$
$\lim_{x\to\infty}\left(\frac{2x^2+5x}{x^3+8x+6}\right)$
$3x^2\left(b-4\right)-2x\left(b-4\right)+5\left(b-4\right)$
$4sinx\:cosx\:=2sinx$
$x\frac{dy}{dx}+3x^2+4y=0\:;\:y\left(1\right)=\frac{1}{2}$
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