1.

cos ^(3) x sin 2x = sum _(x =0) ^(n) ar sin (rx) AA x in R, then

Answer»

`N = 5, a _(1) = 1//2`
`n = 5, a _(1) = 1//4`
`n = 5, a _(2) =-1//8`
`n = 5, a _(2) = 1//4`

Answer :B


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