The angle between planes x+y+z=1 and x−y+z=2 is:
The angle between planes x+y+z=1 and x−y+z=2 is:
- A. 90°
- B. 60°
- C. cos⁻¹(1/3)
- D. 45°
Answer: C) cos⁻¹(1/3)
Explanation: Normals are (1,1,1) and (1,−1,1). Cosθ=1/3.
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