$5x-1\cdot4x-1$
$2-2x-4x^2$
$\left(z+7\right)\left(z+5\right)$
$\lim_{x\to1}\left(\frac{x-3}{3x^2-13x+12}\right)$
$10x^2+4x+2$
$3x^2-26x-9$
$\sin^2\left(x\right)-1=2cos^2\left(x\right)$
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