if a1,a2,a3,a4_ _ _a(n) are in AP with common difference d, then sum of the series sin d (cosec a1.cosec a2+cosec a2+.cosec a3+_ _ _cosec a(n-1).cosec a(n))

Asked by  | 1st Sep, 2012, 10:24: AM

Expert Answer:

Answered by  | 2nd Sep, 2012, 11:53: AM

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