Question
If sec A + tan A = (5/2) and sec A - tan A = (2/5), find
the value of cos A.Solution
sec A + tan A = (5/2) ---------- (I) sec A - tan A = (2/5) --------- (II) on adding (I) and (II) , we get; 2sec A = (29/10) Or, sec A = (29/20) So, cos A = (1/sec A) = (20/29)
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