A function f(x) is even, when? – McqOptions

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1.	A function f(x) is even, when?
A.	f(x) = -f(x)
B.	f(x) = f(-x)
C.	f(x) = -f(x)f(-x)
D.	f(x) = f(x)f(-x)
Answer» C. f(x) = -f(x)f(-x)

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