MCQ
The angle between the planes and `bar"r"*(2hat"i" + hat"j" - hat"k") = 3` and `bar"r"*(hat"i" + 2hat"j" + hat"k") = 1` is ______.
- A`pi/6`
- B`pi/2`
- ✓`pi/3`
- D`pi/4`
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