Question: When two vectors A and B are drawn from a common point, the angle between them is ɸ. (a) Using vector techniques, show that the

When two vectors A and B are drawn from a common point, the angle between them is ɸ.

(a) Using vector techniques, show that the magnitude of their vector sum is given by

VA? + B2 + 2AB cos o


(b) If A and B have the same magnitude, for which value of ɸ will their vector sum have the same magnitude as A or B?

VA? + B2 + 2AB cos o

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