$2cot\left(x\right)-csc\left(x\right)=0$
$\left(2x-7\right)\left(2x+10\right)$
$\left(3x+5y-7\right)^2$
$-3\left(-5n-3\right)$
$v^2-12v$
$\lim_{x\to1}\left(\frac{x^3+3x^2+3x-1}{x^2-2x+1}\right)$
$x+2x+8-x+6$
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