$-12\cos\left(6x\right)\sin\left(6x\right)+16\sin\left(8x\right)\cos\left(8x\right)$
$\frac{9^{2}}{25}-\frac{ab}{5}+\frac{1}{5}$
$\left(6r-4s\right)$
$\sec\:\left(2\theta\:\right)=3$
$33.78-22.19$
$\frac{\left(a^{-2}\right)^6}{\left(a^{-4}\right)-3}$
$4a+12ab$
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