Compute $\arctan 1 + \arctan \frac{1}{2} + \arctan \frac{1}{3}.$  Express your answer in radians.
Question:
Compute $\arctan 1 + \arctan \frac{1}{2} + \arctan \frac{1}{3}.$  Express your answer in radians.
Answer:
Let's think step by step.

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\frac{\pi}{2}
Compute $\arctan 1 + \arctan \frac{1}{2} + \arctan \frac{1}{3}.$  Express your answer in radians.
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