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The value of cos""(pi)/(11)+cos""(3pi)/(...

The value of `cos""(pi)/(11)+cos""(3pi)/(11)+cos""(5pi)/(11)+cos""(7pi)/(11)+cos""(9pi)/(11),` is

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The correct Answer is:
`alpha = (pi)/(11), beta = (2pi)/(11), n =5`
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FIITJEE-MATHEMATICS -NUMERICAL DECIMAL BASED QUESTIONS
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