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Prove if on the real number line R , set A = 0, B = 1,...

Prove if on the real number line R , set A = 0, B = 1, X = x and Y = y (for some x , y ∈ R ) then the condition that X , Y are harmonic conjugates with respect to A , B (i.e. ( A , B ; X , Y ) = − 1) means 1/x + 1/y = 2

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