If $\tan^{-1} x + \tan^{-1} y = \frac{\pi}{4},$ then compute $xy + x + y.$
Question:
If $\tan^{-1} x + \tan^{-1} y = \frac{\pi}{4},$ then compute $xy + x + y.$
Answer:
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If $\tan^{-1} x + \tan^{-1} y = \frac{\pi}{4},$ then compute $xy + x + y.$
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