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2015-08-22T22:12:40+05:30

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Cos π/8  cos 3π/8  cos 5π/8  cos 7π/8
   =  (cos π/8  cos 7π/8) ( cos 3π/8  cos 5 π/8)
   =  [cos 6π/8 - cos 8π/8]/2  [ cos 2π/8 - cos 8π/8]/2
   =  [- 1/√2 + 1 ] [1/√2 + 1] / 4
     = (1 - 1/2 ) /4
   = 1/8

1 5 1
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