1.

If a1,a2,a3,……an are in A.P., with common difference d, then the sum of the series sin d[cosec a1 cosec a2+cosec a1 cosec a3+……+cosec an−1 cosec an] is

Answer»

If a1,a2,a3,an are in A.P., with common difference d, then the sum of the series sin d[cosec a1 cosec a2+cosec a1 cosec a3++cosec an1 cosec an] is



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