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Question

If |a×b|=|a.b|, then (a,b)=

A
0
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B
π
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C
π2
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D
π4
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Solution

The correct option is B π4
|a×b|=|a||b|sinθ ( θ is angle between a,b)
a.b=|a|b|cosθ
tanθ=1
θ=π4

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