$m=\left(x-2\right)\left(x+2\right)\left(x^2+4\right)-x^4$
$\frac{x^3-2x^2+x+4}{x+2}$
$4x+3+x^2-x$
$x^4-3x^3+5x^2$
$\left(3x-6y\right)^2$
$\left(3n^4\right)\left(4n^7\right)$
$\lim_{x\to0}\left(1-cos\:x\right)^{2x}$
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