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If a1, alpha2....., alphan are in A. P. ...

If `a_1, alpha_2....., alpha_n` are in A. P. with common difference d, then the sum of the series, `sind[cosec alpha_1 cosec alpha_2+cosec alpha_2 cosec alpha_3+....+....+cosec alpha_(n-1) cosec alpha_n]` is:

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