$\left(2c\right)^{-2}$
$x-3x-5x-+6$
$\tan\left(x\right)+\:\frac{\cos\left(x\right)}{1+\sin\left(x\right)}$
$\frac{4p^2-4q^2}{3}$
$16+5-26+3-11-9+5-6$
$3+4+5$
$-2x+7<3x-18$
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