Question
Thu October 04, 2012 By:
 

(1+cospie/8)(1+cos3pie/8)(1+cos5pie/8)(1+cos7pie/8) = -1/8 Prove it ??

Expert Reply
Thu October 04, 2012
The value of the expression (1+cospie/8)(1+cos3pie/8)(1+cos5pie/8)(1+cos7pie/8) is 1/8 instead of -1/8.
The proof is given below:

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