A) \[-2\]
B) \[\frac{2}{\sqrt{3}}\]
C) 2
D) \[\frac{-2}{\sqrt{3}}\]
Correct Answer: A
Solution :
\[\cos ec(-{{150}^{o}})\] \[=-\cos ec\,{{150}^{o}}\] \[=-\cos ec\,({{180}^{o}}-{{30}^{o}})\] \[=-\cos ec\,{{30}^{o}}=-2\]
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