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Show that sin A sin ((pi)/(3)+A) sin ((p...

Show that `sin A sin ((pi)/(3)+A) sin ((pi)/(3) -A)=(1)/(4) sin 3A`

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The correct Answer is:
`=(1)/(4). (3)/(4)=(3)/(16)`
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SRISIRI PUBLICATION-TRIGONOMETRIC RATIONS, TRANSFORMATIONS-VSAQ
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