1.

The period of cos (x+8x +27 x+...+n^(3) x) is

Answer»

`(2 PI)/n`
`(2 pi)/(n^(2) (n+1)^(2))`
`(8 pi)/(n^(2) (n+1)^(2))`
`(8 pi)/(n^(3)(n+1)^(2))`

Answer :C


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