If |a| = |b| = 1 and a·b = −1, then angle between them is:
If |a| = |b| = 1 and a·b = −1, then angle between them is:
- A. 0°
- B. 60°
- C. 90°
- D. 180°
Answer: D) 180°
Explanation: cosθ = −1.
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