$\left(2x+3\right)\cdot\:\left(2x+10\right)$
$-7-5-3-\left(+8+6-4\right)$
$\frac{-x^3+4x^2-2x-1}{x-1}$
$2\cos\left(8x\right)\cdot\cos\left(4x\right)$
$3k<27$
$\left(4x+8y\right)^2$
$\left(\sqrt{7}\cdot\sqrt{2}+\sqrt{3}\right)\cdot\left(\sqrt{7}\cdot\sqrt{2}-\sqrt{3}\right)$
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