$e^{x}\sqrt{x}+\frac{e^{x}}{2\sqrt{x}}-\csc x\cot x$
$\sqrt{\frac{a^{12}}{9u^8}}$
$\frac{9x^3+5x+7}{3x^2+4}$
$x^2y-2y=0$
$-4+\frac{5x}{\sqrt{900^2+x^2}}$
$16x^216xy^2+4y^2$
$\left(8m^2-7n\right)^2$
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