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posted by Liz on Thursday, March 1, 2012 at 12:36pm.

Simplify - 2 / (the 6th root of 81)

81 = 3^4 81^(1/6) = 3^(2/3) -2/3^(2/3) = -2*3^1/3 / 3 = -2cuberoot(3)/3

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