A parallelogram is constructed on the vectors a=3α−β,b=α+3β, if |α|=|β|=2 and angle between α and β is π3, then length of a diagonal of the parallelogram is
A
4√5
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B
4√3
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C
4√17
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D
None of these
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Solution
The correct option is D None of these
→a and →b are two adjacent sides of ll gm so sum of sides (adjacent)