1.

If f(x) = (cos x + i sin x)(cos 3x + i sin 3x) ….(cos (2n - 1)x + i(sin(2n - 1)x), then f^(11)(x) is

Answer»

`N^2f(X) `
`-n^(4)F(x)`
`-n^2f(x)`
`n^4f(x)`

Answer :B


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