[MP PET 1992]
A) $ -60^{o} $
B) $ -30^{o} $
C) $ 30^{o} $
D) $ 150^{o} $
Correct Answer: C
$ {{\sec }^{-1}}[\sec (-30^{o})]={{\sec }^{-1}}(\sec 30^{o})=30^{o} $ .
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