A) \[\delta =(\mu -1)\,A\]
B) \[\delta =(\mu +1)\,A\]
C) \[\delta =\frac{\sin \frac{A+\delta }{2}}{\sin \frac{A}{2}}\]
D) \[\delta =\frac{\mu -1}{\mu +1}A\]
Correct Answer: A
Solution :
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