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Simplify the following expressions leaving your answer in index form.
(a) #512^(2/3)×8^(1/3)div2^6#
(b) #(2^(-2)×(2^2)^(-6))/(2^(-4)×2^(-6) )#
(c) #(6/7)^(-2)×(7/6)^(-2)#