$\left(-31\right)\left(-52\right)$
$84:\left(-4\right)$
$\frac{x^2-7x+10}{x-1}$
$10x-1=7x+14$
$\cos^2\csc-\csc=-\sin$
$16^2+4\cdot2$
$\lim_{x\to-1}\left(\frac{x^2-2x+1}{x+1}\right)$
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