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Question

If a·b=|axb|, then θ will be


A

45°

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B

60°

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C

75°

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D

30°

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Solution

The correct option is A

45°


Explanation for the correct option:

Find the value of θ:

Given, a·b=|axb|

|a||b|cosθ=|a||b|sinθ a·b=|a||b|cosθ,|a×b|=|a||b|sinθ

tanθ=1

θ=45°

Hence, Option ‘A’ is Correct.


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