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Mathematics 11 Online
OpenStudy (anonymous):

Three vectors a, b, and c satisfy the following properties: II a II = II c II = 5, II b II = 1, II a - b + c II = II a + b + c II. If the angle between a and b is pi/8, find the angle between b and c. (Answer is 7pi/8, I don't know what to do to get there though)

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