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Functionshard
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A function fff is defined on the set of all real numbers such that f(x)+f(y)=f(x+y)+f(x−y)f(x) + f(y) = f(x+y) + f(x-y)f(x)+f(y)=f(x+y)+f(x−y) is NOT satisfied, but rather f(x)f(y)=f(x+y)+f(x−y)f(x)f(y) = f(x+y) + f(x-y)f(x)f(y)=f(x+y)+f(x−y). If f(0)=2f(0) = 2f(0)=2, which of the following functions could represent f(x)f(x)f(x)?