$\cos^2=0.9$
$\left(2a^6-4\right)^3$
$2x^2.3x^4$
$\left(-28\right)\left(54\right)+\left(-12\right)$
$\sqrt{\frac{-7\sqrt{0+1}+c}{-3}}$
$\left(4y^2\right)^3$
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