$\left(1-cos^x\right)secx$
$\left(8+a\right)\left(8+a\right)$
$2\cdot\:\left[-2-\left(2-2-2\right)\right]$
$14x+3\left(x-10\right)$
$\frac{3}{x-1}=\frac{2}{x+3}$
$2x\left(-n-3\right)-7\left(5+2n\right)$
$\left(1-3ab\right)\left(1+3ab\right)$
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