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ab=3
(a+b)²=a²+2ab+b²
(√15)²=a²+2(3)+b²
15=a²+6+b²
9=a²+b²
(a-b)²= a²-2ab+b²
=a²+b²-2ab
=(9) - 2(3)
=9-6
=3
rpta = 3