A) \[\frac{a\sin (\alpha +\beta )}{\sin (\beta -\alpha )}m\]
B) \[\frac{a\sin (\alpha +\beta )}{\sin (\alpha -\beta )}m\]
C) \[\frac{a\sin (\beta -\alpha )}{\sin (\alpha +\beta )}m\]
D) None of these
Correct Answer: A
Solution :
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