$\lim_{x\to4}\left(\frac{3x-12}{2\left|x-4\right|}\right)$
$cos\:\left(3x\right)-\:cos\:\left(x\right)=sin\:\left(2x\right)$
$\left(\sqrt{12}-4\sqrt{3}\right)^2$
$4x-28$
$sec^2x=\frac{cot^2x+1}{cot^2x}$
$\left(2t+3\right)\left(4t^2-6t+9\right)$
$x^2-16+1$
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