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Show that cos (pi)/(15) cos""(2pi)/(15) ...

Show that cos `(pi)/(15) cos""(2pi)/(15) cos"" (3pi)/(15) cos"" (4pi)/(15) cos"" (5pi)/(15) cos"" (6pi)/(15) cos"" (7pi)/(15) = (1)/(128)`.

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The correct Answer is:
`(1)/(128)`
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