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In a DeltaABC, prove that (a sin(B - C...

In a `Delta`ABC, prove that
`(a sin(B - C))/(b^(2) - c^(2)) = (b sin (C - A))/(c^(2) - a^(2)) = (c sin (A - B))/(a^(2) - b^(2))`

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The correct Answer is:
`(c sin (A - B))/(a^(2) - b^(2))`
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