$\left(2-m\right)\left(4+2m+m^2\right)$
$f\left(x\right)=\left|x\right|-\left|x\right|$
$\left(x^{\frac{1}{2}}-2\right)^2$
$x2+8x+6$
$9-\frac{x^2}{4}$
$8cos^3\left(x\right)sin\left(x\right)-4cos\left(x\right)sin\left(x\right)$
$\lim_{x\to\infty}10-\frac{2}{x^2}$
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