$9-\left[\left(-5\right)-\left(+17\right)\right]$
$5a\left(2ab-4a^2c\right)$
$\left(2^8-3^5\right)$
$\frac{5^{-2}\:\left(3\right)\:+\:5\left(3\right)^{-2}}{5^{-1}-3^{-1}}$
$\frac{sec\left(x\right)tan\left(x\right)}{sec\left(x\right)-1}$
$\left(s+\frac{2}{3}t\right)^2$
$\left(21x^3+14x^2-11x+7\right)+\left(4x^3-7x^2+7x-5\right)$
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