A) \[-{{60}^{o}}\]
B) \[-{{30}^{o}}\]
C) \[{{30}^{o}}\]
D) \[{{150}^{o}}\]
Correct Answer: C
Solution :
\[{{\sec }^{-1}}[\sec \,(-{{30}^{o}})]={{\sec }^{-1}}(\sec {{30}^{o}})={{30}^{o}}\].
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