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The angle (in degree) between two planes vectors overrightarrow rm a...

This question belongs to Engineering Maths Calculus
Calculus
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The angle (in degree) between two planes vectors \[\overrightarrow {\rm{a}} = \frac{{\sqrt 3 }}{2}{\rm{\hat i}} + \frac{1}{2}{\rm{\hat j}}\]    and \[\overrightarrow {\rm{b}} = \frac{{ - \sqrt 3 }}{2}{\rm{\hat i}} + \frac{1}{2}{\rm{\hat j}}\]    is

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Correct Answer: Option D
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