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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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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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