The value of the expression tan⁡12cos−1⁡25 is

The value of the expression tan12cos125 is

  1. A

    2+5

  2. B

    5-2

  3. C

    5+22

  4. D

    5+2

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    Solution:

    tan12cos125=1coscos1251+coscos125=1251+25=525+2×5252=(52)254=52

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