$cos2b=\frac{2-sec^2b}{sec^2b}$
$x^2-6x=9$
$m^{-9}m^5m^{-1}$
$\lim_{x\to5}\left(\frac{x^2-25}{x^2+2x-25}\right)$
$x^2-x-8$
$\frac{1}{3}\left(9p+36\right)=48$
$\frac{t+1}{2}v^t$
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