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Expand and simplify each of the following expressions :
(a) (ax + b)(2ax - 3b)
(b) (4 - 2x)(#1/2# - x)
(c) (6x - 5)(5x + 6)
(d) (y - 2)(y + 2)
(e) (x + 2a) (x + 2a)
(f) (3x - 4)(5x - 6)