Question
If sec A + tan A = 7 and sec A - tan A = (1/7), find
the value of cos A.Solution
sec A + tan A = 7 ---------- (I) sec A - tan A = (1/7) --------- (II) on adding (I) and (II) , we get; 2sec A = (50/7) Or, sec A = (25/7) So, cos A = (1/sec A) = (7/25)
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