Evaluate using suitable identity.
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(a/2-3/b)² = (a-b)²=a²+b²-ab
(a/2)²+(3/b)²-2×a/2×3/b
a²/4+9/b²-3a/b
(a/2)²+(3/b)²-2×a/2×3/b
a²/4+9/b²-3a/b
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a/2 - 3/b = ab-6/2b
(a/2 - 3/b)^2 = (ab-6)^2/(2b)^2
={(ab)^2 - 12ab + 36}/4b^2
(a/2 - 3/b)^2 = (ab-6)^2/(2b)^2
={(ab)^2 - 12ab + 36}/4b^2
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