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Use the quadratic identities to write down the expansions of each of the following expressions :
(a) #(1/2 a-1/3 b) ^2#
(b) #(1-1/a) (1+1/a)#
(c) #(1/x+1/y) (1/x-1/y)#
(d) #(-2x - 3y)(-2x + 3y)#