I am revising analytic geometry and I came across the following question about angles between vectors.

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the resultant vector of two vectors is 50 units long, and forms an angle of 37 degrees with one of the component vectors A which is 10 units long, what angle does the other vector B form with A; I have no idea how to start solving it, I tried to set up systems involving the coordinates of the vectors, but it didn't work.