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Let the points on the plane P be equidistant from the points (–4, 2, 1) and (2, –2, 3). Then the acute angle between the plane P and the plane 2x + y + 3z = 1 is

1. 6 π
2. 4 π
3. 3 π
4. 12 5 π

Correct answer: 3 π

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