why angle between two vectors can't be more than 180 degrees?? explain with explanation........
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To understand this, consider two vectors A and B.
The square of sum of these vectors is A^2 + 2 A B cos ( theta ) + B^2.
( Theta ) is angle between A and B.
This is maximum when ( theta ) = 0. ( there is no point in taking ( theta = 2 pi, 4pi…….) as they give same direction.
The minimum value will be for ( theta = pi). If we go beyond ( Theta = pi ), the values of cos ( theta ) get repeated.
So, (theta ) varies between 0 and pi only.
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