$\left(-3x^4-5x^2\right)^2$
$\left(5\sqrt{a+2}\right)\left(2\sqrt{a-3}\right)$
$\cos2y=\frac{1-\tan^2y\:}{1+\tan^2y}$
$16,75\cdot312,21\:$
$\left(\frac{1}{4}\right)^{-4}$
$\left(u-3v\right)^4$
$1-5-6$
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