$\left(a^{-2}-2x^3\right)^2$
$x\left(x-2\right)\ge\:3$
$\left(a^{2x}\right)^2-4b^2$
$x^3-x^9$
$1020^2-1010^2$
$0,9b^2c^3+7,7\:b^2c^3$
$\frac{cosa-2cos\left(\frac{\pi\:}{3}+a\right)}{2sin\left(a-\frac{\pi\:}{6}\right)-\sqrt{3}sina}$
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