$\frac{3^{13}}{3^{11}}$
$5a^2b^3;\:a=1;\:b=2$
$\left(\frac{5^{-1}}{5^{-2}+4\cdot5^{-3}}\right)^{-\frac{1}{2}}$
$2x^2-2x+5$
$y\cdot\frac{dy}{dx}=5x$
$\left(\frac{7}{2}x+3\right)\left(\frac{7}{2x}+9\right)$
$\int\left(4x\left(x^2-9\right)^{10}\right)dx$
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