(a) If 60^a=3 and 60^b=5, then find 12^(1-a-b)/(2(1-b).

(a) If 60^a=3 and 60^b=5, then find 12^(1-a-b)/(2(1-b). 

(b) Find x if log_(2)x^2+log_(1/2)x=5. 

(c) Suppose A and B are positive real numbers for which log_(A)B=log_(B)A. If neither A nor B is 1 and A≠B, find the value of AB.