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    Question

    cos (sec-1 x) is equal to тАУ

    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┬аx = cos-1┬а(1/x) => cos (sec-1┬аx) = cos (cos-1┬а1/x) => 1/x

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