$32-\left(-9-8\right)-\left(-2-5-7\right)-6$
$\frac{d}{dx}\sqrt{3x+7}$
$x=u'$
$\frac{2x^{-2}}{2x^3}$
$3 x - 2 y + 5 ) ^ { 2 }$
$\sqrt{2}+\:\sqrt{2}$
$ycos2x+\frac{1}{1+4y^2}$
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