A binary operation A is defined on the set R of real numbers by a Ab= a + b - 2ab, where a, b, eR. (a) Calculate (5 – 3 2 ) A (6 + 5 /2 ), giving your answer in the form m + where m and n are rational numbers. (b) Determine whether or not the operation A is commutative. (c) Find the identity element e of R under the operation. (d) Find the inverse of a general element a e R, and state which element of R has inverse