$9x^2-8x+4$
$27a^3-b^3$
$5\left(1.3195\right)$
$\left(-\frac{1}{\arctan\left(e^x\right)}\right)\left(e^x+e^{-x}\right)$
$\cos\left(3x\right)\:\cos\left(x\right)\:+\:sen3x\:senx$
$\frac{2}{3}x\le2$
$19a-2p-5a+10p$
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