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If A+B+C=180^@ " then " sin^(2)""(A)/(2)...

If `A+B+C=180^@ " then " sin^(2)""(A)/(2)-sin^(2)""(B)/(2)+sin^(2)""(C)/(2)=`

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The correct Answer is:
`(r)/(2R)` = RHS
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