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Let tan^-1 2x+tan^-1 3x= pi/4 where xge0...

Let `tan^-1 2x+tan^-1 3x= pi/4` where `xge0`. Let `S` is the set containing all the solutions of the equation then `S` contains (A) one element (B) Two element (C) more than two element (D) none of these

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