$-2+3+6-\left(-5-2+9-7\right)$
$x\sqrt{5+1}$
$\frac{2e^x+e^2^x}{e^x}$
$\frac{-2x^2+7x-6}{x-3}$
$\cot2a\:=\frac{cot-tag}{2}$
$\left(3\right)\left(25x^2\right)\left(1\right)$
$\left(\left(9+3x\right)^{\frac{4}{x}}\right)$
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