1.

If sin 3alpha = 4 sin alpha sin (x + alpha)sin(x-alpha), then x =

Answer»

`N PI +-pi//4, AA n in Z`
`n pi +-pi//3, AA n in Z`
`n pi +-pi//9, AA n in Z`
`n pi +-pi//12, AA n in Z`

ANSWER :B


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