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Prove that : 2cos""(pi)/(13)cos""(9pi)...

Prove that :
`2cos""(pi)/(13)cos""(9pi)/(13)+cos""(3pi)/(13)+cos""(5pi)/(13)=0`

Answer

Step by step text solution for Prove that : 2cos""(pi)/(13)cos""(9pi)/(13)+cos""(3pi)/(13)+cos""(5pi)/(13)=0 by MATHS experts to help you in doubts & scoring excellent marks in Class 11 exams.

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    A
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