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Question

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(xy) equals :

A
2f1(x)f1(y)
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B
2f1(x+y)f1(xy)
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C
2f1(x)f2(y)
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D
2f1(x+y)f2(xy)
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