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If sin 3 alpha =4 sin alpha sin (x+alph...

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

A

`x=npi pm (pi)/(3), n in I `

B

`x=npi pm (pi)/(6), n in I `

C

`x=npi pm (pi)/(2) , n in I `

D

None of the above

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The correct Answer is:
A
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