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a²+b² = 1600
a²+b² = (a+b)²-2ab
1600 = 3136-2ab
ab = 768
x²+y² = 1600
x.y = ?
x²+y² =(x+y)² -2xy
1600 = 56² - 2xy
1600 = 3136 - 2xy
1600-3136 = -2xy
-1536 = -2xy
768 = xy
^_^