A) \[a\,\,\sin \,\,\frac{\phi }{2}\,\,\,\operatorname{cosec}\theta \]
B) \[\frac{a}{2}\,\,\sin \phi \,\,\operatorname{cosec}\,\,\frac{\theta }{2}\]
C) \[\frac{a}{2}\,\,\sin \,\,\frac{\phi }{2}\,\,\operatorname{cosec}\theta \]
D) \[a\,\,\sin \,\,\phi \,\operatorname{cosec}\,\,\frac{\theta }{2}\]
E) None of these
Correct Answer: D
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