Class 12 Vector Algebra · Mcq Single Correct1 Marksdot_product_angle
Class 12 Maths · Vector Algebra · Mcq Single Correct #85
Unit vectors a,b have a+b also unit. Find their angle.
✅ Step-by-Step Solution
Final Answer: Option (D): 2π/3
- 1=|a+b|²=2+2cos θ, giving cos θ=−1/2 and θ=2π/3.
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