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If a DeltaABC, a,b, A are given and b(1)...

If a `DeltaABC, a,b,` A are given and `b_(1), b_(2)` are two values of the third sides b such that `b_(2)=2b_(1).` Then, sin A is equal to

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The correct Answer is:
`sqrt((9a^(2)-c^(2))/(8c^(2)))`
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