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cos ^(3) x sin 2x = sum (x =0) ^(n) ar s...

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

A

`n = 5, a _(1) = 1//2`

B

`n = 5, a _(1) = 1//4`

C

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

D

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

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The correct Answer is:
B
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