1.

If sin^3xsin3x=sum_(m=0)^(6)c_mcos^(m)x , where c_(0),c_1,......c_6 are constants then

Answer»

`c_0+c_2+c_4+c_6=0`
`c_(1)+c_(3)+c_(5)=6`
`2c_(2)+3c_6=0`
`c_(4)+2c_(6)=0`

ANSWER :A


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