A) \[-\sqrt{2}\]
B) \[\sqrt{2}\]
C) \[\frac{2}{\sqrt{3}}\]
D) \[\frac{-2}{\sqrt{3}}\]
Correct Answer: B
Solution :
\[\cos ec\frac{3\pi }{4}=\cos ec\left( \pi -\frac{\pi }{4} \right)\] \[=\cos ec\frac{\pi }{4}=\sqrt{2}\]You need to login to perform this action.
You will be redirected in
3 sec