A) \[90{}^\circ +\frac{\angle A}{2}\]
B) \[90{}^\circ -\frac{\angle A}{2}\]
C) \[90{}^\circ -\frac{\angle A}{4}\]
D) \[45{}^\circ +\frac{\angle A}{2}\]
E) None of these
Correct Answer: B
Solution :
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