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[" If "a(1),a(2),a(3)......a(n)" are in ...

[" If "a_(1),a_(2),a_(3)......a_(n)" are in AP with common difference "d," then find the sum of the following series: "],[sin d(cosec a_(1)*cosec a_(2)+cosec a_(2)*cosec a_(3)+....+cosec a_(n-1)cosec a_(n))]

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