$x2\:-\:20x\:+8$
$\frac{\cot\left(x\right)}{\sec\left(x\right)-\tan\left(x\right)}$
$\frac{1}{u-1}+\frac{1}{u-1}$
$\left(8x^2+9yz\right).\left(8x^2-9yz\right)$
$12m+20mx+40my$
$\left(12x^3-6\right)\left(12x^3+6\right)$
$\left(3x+10\right)\left(9x^2-30x+100\right)$
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