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    Question

    If sec A + tan A = 3 and sec A - tan A = (1/3), find

    the value of cos A.
    A 5/3 Correct Answer Incorrect Answer
    B 3/5 Correct Answer Incorrect Answer
    C 4/5 Correct Answer Incorrect Answer
    D 5/4 Correct Answer Incorrect Answer

    Solution

    sec A + tan A = 3 ---------- (I) sec A - tan A = (1/3) --------- (II) on adding (I) and (II) , we get; 2sec A = (10/3) Or, sec A = (5/3) So, cos A = (1/sec A) = (3/5)

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