Expression : sec A + tan A = x = $$frac{1}{cos A} + frac{sin A}{cos A} = frac{1 + sin A}{cos A}$$ Using, $$sin^2 A + cos^2 A = 1$$ = $$frac{1 + sin A}{sqrt{1 - sin^2 A}} = frac{1 + sin A}{sqrt{(1 + sin A) imes (1 - sin A)}}$$ = $$frac{sqrt{1 + sin A}}{sqrt{1 - sin A}} = sqrt{frac{1 + sin A}{1 - sin A}}$$ => Ans - (D)
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