A) \[-\sqrt{2}\]
B) \[\sqrt{2}\]
C) \[\frac{2}{\sqrt{3}}\]
D) \[\frac{-2}{\sqrt{3}}\]
Correct Answer: B
Solution :
\[\cos ec\frac{3\pi }{4}=\cos ec\left( \pi -\frac{\pi }{4} \right)\] \[=\cos ec\frac{\pi }{4}=\sqrt{2}\]
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