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OpenStudy (anonymous):
Two vectors A and B ( aero on them ) are such that |A| ( aero on it ) = 3 and |B| ( aero on it ) =4 and A.B ( aero on them )= -5 , find : (a) the angle between A and B ( aero on them ). (b) The length |A+B| and |A-B| ( aero on them both). (c) the angle between (A+B) and (A-B) ( aero on them both). I have found (a) and (b) , but i dont know how to find (c) can any one help me ?
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