1.

​​​​​The sum of n terms of the seriescosec−1√10+cosec−1√50+cosec−1√170+⋯+cosec−1√(n2+1)(n2+2n+2) is

Answer»

​​​​​The sum of n terms of the series

cosec110+cosec150+cosec1170++cosec1(n2+1)(n2+2n+2) is



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