A) \[r\,\text{cosec}\frac{\alpha }{2}\sin \beta \]
B) \[\frac{r\,\text{cosec}\,\alpha }{2\sin \beta }\]
C) \[\frac{r\,\text{cosec}\,\alpha }{2\cos \beta }\]
D) \[r\sin \alpha \sin \beta \]
Correct Answer: A
Solution :
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