$\sqrt{\frac{u-1}{u+1}}.\sqrt{x}$
$0.5e^2$
$\frac{5x^3-4x-6}{x+1}$
$\sec^2x=-2\sec x$
$-4\left(9f+9\right)$
$9a^2-6a^2x+3a^3x^2$
$3b^0\cdot2b$
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