Question

cos (sec-1 x) is equal to –

A x Correct Answer Incorrect Answer
B cos^2 x Correct Answer Incorrect Answer
C 1/x Correct Answer Incorrect Answer
D None of these Correct Answer Incorrect Answer

Solution

=> sec-1 x = cos-1 (1/x) => cos (sec-1 x) = cos (cos-1 1/x) => 1/x

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