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## Homework Statement

A. If A*B=-(1/2)AB, what do you know about A and B.

B. If A*B=5Ay-7Ax, find B.

## Homework Equations

## The Attempt at a Solution

Part A I know the angle is 120 degrees in between A and B. Would I know more about the two vectors from that?

Part B. I don't know where to begin to try and answer that?