|a vector ×b vector |=a vector . b vector find angle between them
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Answer:
a×b=a.b when angle is 45°
Explanation:
a×b means cross product and a.b means dot product
a×b=absin* and a.b=abcos*
thus axb/a.b=absin*/abcos*
sin*/cos*=tan*=1
therefore *=45
Answered by
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Answer:
|a X b| = ab sin theta
a . b = ab cos theta
ab sin theta = ab cos theta
sin theta = cos theta
As sin 45 = cos 45 = 1/√2
theta = 45°
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