$\left(y-9\right)\left(y-3\right)$
$\sec^260+\csc^260$
$4\cos\left(k\right)=6\tan\left(k\right)$
$\left(x^2-1\right)\left(x^2-11x+28\right)$
$\sin\:^2\left(x\right)+\csc\:\:^2\left(x\right)-1$
$\lim_{x\to\:3}\frac{\sqrt{2x-5}-1}{x-3}$
$3x^2-12x=12x$
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