$3x-5x^2-1$
$\left(-1\right)\left(2\right)\left(-3\right)\left(-2\right)\left(1\right)$
$\left(1-\sin\left(\frac{\pi}{2}-x\right)\right)\left(1+\sin\left(\frac{\pi}{2}+x\right)\right)$
$9-6f+f^2$
$\lim_{x\to-\infty}\left(\frac{\left(x^2-51\right)}{x-2}\right)$
$6x+4y=400$
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