1.

cos ^(3) x sin 2x= sum _(x=0) ^(n) a _(r) 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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