1.

If "cos"(pi)/(15) "cos"(2pi)/(15) "cos"(4pi)/(15) "cos"(5pi)/(15) "cos"(7pi)/(15) "cos"(30pi)/(15) =x, " then " (1)/(8x) =

Answer»

4
`(1)/(4)`
8
`(4)/(3)`

ANSWER :A


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