Expression : secA - tanA = x Multiplying and dividing by $$(sec A + tan A)$$ = $$(sec A - tan A) imes frac{sec A + tan A}{sec A + tan A}$$ = $$frac{sec^2 A - tan^2 A}{sec A + tan A}$$ Using, $$sec^2 A - tan^2 A = 1$$ = $$frac{1}{sec A + tan A}$$ => Ans - (D)
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