Let f(x) = ax (a > 0) be written as f(x) = f1(x) + f2(x), where, f1(x) is an even function and f2(x) is an odd function. Then f1(x + y) + f1(x – y) equals:

Let f(x) = ax (a > 0) be written as f(x) = f1(x) + f2(x), where, f1(x)

1.	Let f(x) = ax (a > 0) be written as f(x) = f1(x) + f2(x), where, f1(x) is an even function and f2(x) is an odd function. Then f1(x + y) + f1(x – y) equals:
A.	2f1(x)f1(y)
B.	2f1(x + y)f1(x – y)
C.	2f1(x)f2(y)
D.	2f1(x + y)f2(x – y)
Answer» B. 2f1(x + y)f1(x – y)

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