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Prove that tan(π/4+1/2cos^-1a/b)+tan(π/4-1/2cos^-1a/b)=2b/a

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Prove that tan(π/4+1/2cos-1a/b)+tan(π/4-1/2cos-1a/b)=2b/a

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L.H.S.

=2b/a =R. H.S.

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