$3x^2-6x\:+0$
$-x^2-2x+8<0$
$\frac{\left(\cos\left(a\right)-1\right)}{\left(\cos\left(a\right)+1\right)}$
$\frac{x^3-8x^2+17x-10}{x-3}$
$\lim_{x\to\infty}\sqrt{x^2+9x}-\sqrt{x^2+5x}$
$7\cdot4\cdot5$
$\left(2m^2+7\right)\left(3m^2-11\right)$
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