Question
If sec A + tan A = 3 and sec A - tan A = (1/3), find
the value of cos A.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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