Solve the pair of linear equations
(a+b)x + (a-b)y = a^2+b^2
(a-b)x + (a+b)y =a^2+b^2
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Solution of (a-b)x + (a+b)y = (a2 - 2ab - b2 ) , (a+b) (x+y) = a2 +b2 .
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