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# help

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Suppose $$f(x)$$ is an invertible function, and suppose that $$f(2)=f^{-1}(2)=4$$.what is the value of $$f(f(2))$$?

Feb 15, 2019

$$f(2) = f^{-1}(2) = 4\\ \text{Take }f(\cdot) \text{ of both sides}\\ f(f(2)) = f(f^{-1}(2)) = 2$$