simplify 3 to the power-2 by 3 into 3to the power 0 -3 to the power -1
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3^(-2/3) × 3^0 - 3^(-1)
=3^(-2/3) × 1 - 3^(-1)
=3^(-2/3) - 3^(-1)
=1/3^(2/3) - 1/3
=(1/3)[1/3^(-1/3) - 1]
=(1/3)[3^(1/3) - 1]
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