The graph of $xy = 1$ is a hyperbola.  Find the distance between the foci of this hyperbola.
Question:
The graph of $xy = 1$ is a hyperbola.  Find the distance between the foci of this hyperbola.
Answer:
Let's think step by step.

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The graph of $xy = 1$ is a hyperbola.  Find the distance between the foci of this hyperbola.
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