If $f (x) = x^2 - 1$, what is the value of $f (-1)$?
Question:
If $f (x) = x^2 - 1$, what is the value of $f (-1)$?
Answer:
Let's think step by step.

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If $f (x) = x^2 - 1$, what is the value of $f (-1)$?
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