Let n be a fixed positive integer such that \[\sin \left( \frac{\pi }{2n} \right)+\cos \left( \frac{\pi }{2n} \right)=\frac{\sqrt{n}}{2},\] then:

Let n be a fixed positive integer such that \[\sin \left( \frac{\pi }{

1.	Let n be a fixed positive integer such that \[\sin \left( \frac{\pi }{2n} \right)+\cos \left( \frac{\pi }{2n} \right)=\frac{\sqrt{n}}{2},\] then:
A.	\[n=4\]
B.	\[n=5\]
C.	\[n=6\]
D.	None of these
Answer» D. None of these

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Let n be a fixed positive integer such that \[\sin \left( \frac{\pi }{2n} \right)+\cos \left( \frac{\pi }{2n} \right)=\frac{\sqrt{n}}{2},\] then:

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