$\left(4x+3\right)\left(2x+7\right)$
$4\cos\left(4x-15\right)$
$\lim_{x\to0}\left(\frac{\sqrt{1+\tan\left(x\right)}-\sqrt{1-\sin\left(x\right)}}{x^3}\right)$
$-1487,3-876$
$4\sqrt{7}2\sqrt{7}$
$10\:cm\:20cm\:\sqrt{300}$
$4x^2-5x-6$
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