Q.
If A and B are two vectors such that |A+B|=2|A-B|, the angle between vectors A and B is
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a
45°
b
60°
c
90°
d
Data insufficient
answer is D.
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Detailed Solution
A2+B2+2ABcosθ=2A2+B2-2ABcosθFrom this equation, we cannot find θ.
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