$-3a^2-2a+1$
$\cot^2\left(b\right).\:\tan^2\left(b\right)+1=2$
$\left(8x^2\right)\left(8x^2\right)$
$\lim_{x\to0}\left(\frac{\sqrt{6-x}-\sqrt{6}}{x}\right)$
$\frac{x^2+5}{4x}=\frac{9}{8}$
$2x^2-18x+25$
$\left(-5\right)\left(-3\right)\left(-2\right)$
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