A) \[\frac{1}{2}\left( \pi -\frac{1}{2} \right)\]
B) \[\frac{1}{2}(\pi -1)\]
C) \[\left( \frac{\pi }{2}-1 \right)\]
D) \[\left( \frac{\pi }{2}-2 \right)\]
E) None of these
Correct Answer: C
Solution :
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