$\frac{x^3+3x^2-x+2}{x^2}$
$\left(2m^2-3n^4\right)^5$
$x+12=126$
$\lim_{x\to0}\frac{6x^3-4x}{2x^4+x}$
$\left(y+\frac{1}{3}\right)\:\left(y-\frac{1}{3}\right)$
$\left(5x-2y\right)\left(8x+3y\right)$
$\frac{\left(\senx+\cos x\right)}{\sen^{2}x-\cos^{2}x}$
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