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Which function satisfies f(f(x)) = x for every nonzero real x?
Af(x) = 2x
Bf(x) = x²
Cf(x) = 1/x
Df(x) = x + 1
Answer & Solution
Correct answer: C. f(x) = 1/x
Taking the reciprocal twice returns x, so 1/x is its own inverse.
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