Question

Considering the principal values of inverse trigonometric functions, the positive real values of ‘x’ satisfying tan-1(x) + tan-1(2x) = π 4 is :


Options :

  1. (-1 +√5)/2

  2. (3 + √17)/4

  3. (-3 + √17)/4

  4. (1 + √5)/2

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Answer :

(-3 + √17)/4

Solution :

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