$11x^2-11x+7$
$20x^4+5n^5$
$\left(\sec a-\tan a\right)^2=\frac{1-\sin a}{1+\sin a}$
$\frac{5ab}{\left(a^ob^2\right)^4}$
$\left(4x+5\right)\left(4x-7\right)$
$\frac{5^{-1}}{-9^0}$
$\frac{\sin\left(x\right)+\cos\left(x\right)}{cos\left(x\right)}=1-\frac{1}{tan\left(x\right)}$
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