Easy
Which expressions are equivalent to (b2)19(b^{2})^{\frac{1}{9}}(b2)91
b29b^{\frac{2}{9}}b92
(b−19)2(b^{\frac{-1}{9}})^2(b9−1)2
(b12)9(b^{\frac{1}{2}})^9(b21)9
None of the above
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