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Sticky Note
If f(x)=−1, what is f(f(−1))?
  1. -1
  2. 0
  3. 1
  4. Undefined
Explanation
We are told
f(x)=−1 for any input x.

Sof(−1)=−1.

Then f(f(−1))=f(−1)=−1.

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