Mathematics · Vectors
Let a and b be two unit vectors. If c = a + 2b and d = 5a - 4b are perpendicular to each other, then the angle between a and b is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1π6
- 2π4
- 3π3✓
- 4π8
Correct answer
π3
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