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cos^3x.sin2x=sum(m=1)^n(am)sin mx is an ...

`cos^3x.sin2x=sum_(m=1)^n(a_m)sin mx` is an identity in x.

A

`a_(3) = 3/8, a_(2)=0`

B

`n=6, a_(1)=1/2`

C

`n=5, a_(1)=1/4`

D

`suma_(m)=3/4`

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The correct Answer is:
A, C
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