Question

tan^-1x + tan^-1y = π/2 then xy =

Answer 1

Answer:

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Answer 2

Answer:

Given that tan-1 x +  tan-1 y + tan-1 z

= π/2 => xz + yz = 1 – xy => xz + yz + xy = 1 => xy + yz + zx = 1

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