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question from s.l.loney page no. 130
question no. 8 and 9.
Dear neeraj
cos(π/15) .cos(2π/15) .cos(3π/15) .cos(4π/15) .cos(5π/15) .cos(6π/15) .cos(7π/15)
=cos(π/15) .cos(2π/15) .cos(π- 12π/15) .cos(4π/15) .cos(π/3) .cos(6π/15) .cos(π-8π/15)
={cos(π/15) .cos(2π/15) .cos(4π/15) .cos(π-8π/15) }.{cos(π/3)}.{cos(6π/15).cos(8π/15)}
use the formula
=-1/24 * 1/2 * -1/22
=1/27
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