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      Question

      If sec A + tan A = 4 and sec A - tan A = (1/4), find

      the value of cos A.
      A 8/17 Correct Answer Incorrect Answer
      B 17/8 Correct Answer Incorrect Answer
      C 15/17 Correct Answer Incorrect Answer
      D 4/5 Correct Answer Incorrect Answer

      Solution

      sec A + tan A = 4 ---------- (I) sec A - tan A = (1/4) --------- (II) on adding (I) and (II) , we get; 2sec A = (17/4) Or, sec A = (17/8) So, cos A = (1/sec A) = (8/17)

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