Mathematics · Vector Algebra
If a and b are two unit vectors such that vectors a + 2b and 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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- 1cos-127
- 2cos-113
- 3π3✓
- 4π4
Correct answer
π3
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