$36-12m^2+m^4$
$4r^2+12rt+9t^2$
$\lim_{x\to0}\left(\frac{cos\left(2x\right)-\cos\left(4x\right)}{x^2}\right)$
$\frac{2x-6a}{ax-2y}\cdot\frac{2x+4y}{bx-3bx}$
$3y^2+12y+12=0$
$\lim_{x\to0}\left(\frac{6}{x-3}\right)$
$x^3-10x^2+13x+24$
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