The numerical value of cosπ9cos2π9cos3π9cos4π9 is equal to

The numerical value of cosπ9cos2π9cos3π9cos4π9 is equal to

  1. A
  2. B
  3. C
  4. D

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    Solution:

    we have,

    cos200cos400cos600cos800=1412cos3(200)=116=0.0625

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