Class 12 Vector Algebra · Mcq Single Correct1 Marksvector_identities
Class 12 Maths · Vector Algebra · Mcq Single Correct #88
If |a×b|=4 and |a·b|=2, find |a|²|b|².
✅ Step-by-Step Solution
Final Answer: Option (D): 20
- Lagrange’s identity gives |a|²|b|²=4²+2²=20.
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