$\frac{d}{dx}\left(\left(x-6\right)\left(2x+5\right)\right)$
$x^210x+25$
$sinx=\frac{1}{7}$
$\lim_{x\to-1}\left(-\frac{x^2-1}{x+1}\right)$
$b^2=3b+28$
$y^2=x-2$
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