1.

If -1,α,α3,α5,¯¯¯¯α,¯¯¯¯¯¯α3,¯¯¯¯¯¯α5 are the roots of the equation z7 + 1 = 0. Find the value of cosπ7 × cos3π7 × cos5π7.

Answer»

If -1,α,α3,α5,¯¯¯¯α,¯¯¯¯¯¯α3,¯¯¯¯¯¯α5 are the roots of the equation z7 + 1 = 0. Find the value of cosπ7 × cos3π7 × cos5π7.




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