1.

The periodof cos (x+ 4 x+ 9x…. +n^(2) x) is

Answer»

`( 2pi)/( N ( n+1)(2n+1))`
`(4pi)/( n (n+1) (2n+1) )`
`(6pi)/(n (n+1) (2n+1))`
`(8pi)/( n (n+1) (2n+1))`

ANSWER :C


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