$6^2+2$
$\left(16\right)-\left(-16\right)$
$\left(k^2+0.7\right)\left(k^2-0.7\right)$
$2x\log_{10}\left(\sqrt{x}\right)$
$\sin\:\left(x\right)-\sqrt{3}\cos\:\left(x\right)=1$
$\frac{1}{10}+\frac{-1}{10}$
$\tan^2a-\sec^2a$
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