CBSE Class 12 Mathematics 2026 Main Paper 65(B) · Q121 Marksdot_products
CBSE Class 12 Mathematics 2026 Main Paper 65(B) · Question 12 (Vector Algebra)
For unit vectors a,b, when is a+2b also a unit vector?
✅ Step-by-Step Solution
Final Answer: θ=π
- Its squared norm is 5+4 cos θ. Setting it to 1 gives cos θ=−1.
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