The value of cos⁡tan−1⁡tan⁡15π4, is

The value of costan1tan15π4, is

  1. A

    12

  2. B

    12

  3. C

    1

  4. D

    none of these

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    Solution:

    We have,

    costan1tan15π4=costan1tan4ππ4=costantan1π4=cosπ4=cosπ4=12

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