MathematicsMedium110×since 2002Q3854Let ƒ(x) = a^x (a > 0) be written as ƒ(x) = ƒ₁ (x) + ƒ₂ (x), where ƒ₁ (x) is an even function of ƒ₂ (x) is an odd function. Then ƒ₁ (x + y) + ƒ₁ (x – y) equalsA2ƒ₁ (x)ƒ₁ (y)B2ƒ₁ (x + y)ƒ₁ (x – y)C2ƒ₁ (x)ƒ₂ (y)D2ƒ₁ (x + y)ƒ₂ (x – y)Check answerSkip