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Suppose cos""(2pi)/7+ cos""(4pi)/7 + co...

Suppose `cos""(2pi)/7+ cos""(4pi)/7 + cos""(6pi)/7 =-1/2 and cos""(2pi)/7cos""(4pi)/7cos""(6pi)/7=1/8` , then the numerical value of `"cosec"^(2)(pi)/7 + "cosec"^(2)(2pi)/7+ "cosec"^2(3pi)/7` must be

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