मराठी

Tan[2tan-1(13)-π4] = ______. -

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प्रश्न

`tan[2tan^-1 (1/3) - pi/4]` = ______.

पर्याय

  • `1/7`

  • `-1/7`

  • `17/7`

  • `-17/7`

MCQ
रिकाम्या जागा भरा

उत्तर

`tan[2tan^-1 (1/3) - pi/4]` = `-1/7`.

Explanation:

`tan[2tan^-1 (1/3) - pi/4]`

= `tan[tan^-1 ((2/3)/(1 - 1/9)) - tan^-1 (1)]`  .......`[because 2tan^-1 x = tan^-1((2x)/(1 - x^2))]`

= `tan[tan^-1 (3/4) - tan^-1 (1)]`

= `tan[tan^-1  ((3/4 - 1)/(1 + 3/4))]`

= `tan[tan^-1 (-1/7)]`

= `-1/7`

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