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a.b = 25
a^2 + b^2 = (a+b)^2 - 2a.b
= (13)^2 - 2 (25)
= 169 - 50
=119
xy = 25
ditanya x²+y²
x²+y² = (x+y)²-2xy
= 13²-2.25
= 169-50
= 119