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If A+B+C=pi, " prove that sin"^(2) ""A/...

If `A+B+C=pi, " prove that sin"^(2) ""A/2+sin^(2) ""B/2+sin^(2) ""C/2=1-2 sin ""A/2 sin ""B/2 sin ""C/2`

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The correct Answer is:
`1-2 sin ""A/2sin ""B/2 sin""C/2`
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