Find all numbers in the range of
\[f(x) = \arctan x + \arctan \frac{1 - x}{1 + x},\]expressed in radians.  Enter all the numbers, separated by commas.
Question:
Find all numbers in the range of
\[f(x) = \arctan x + \arctan \frac{1 - x}{1 + x},\]expressed in radians.  Enter all the numbers, separated by commas.
Answer:
Let's think step by step.

user
-\frac{3 \pi}{4}, \frac{\pi}{4}
Find all numbers in the range of
\[f(x) = \arctan x + \arctan \frac{1 - x}{1 + x},\]expressed in radians.  Enter all the numbers, separated by commas.
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