We were asked to form the transformation matrix that rotates the x(adsbygoogle = window.adsbygoogle || []).push({}); _{1}axis of a rectangular coordinate system 60 degrees toward x_{2}and the x_{3}axis.

The thing is, I don't understand what it meant by rotating one axis toward the two other. Like, do I rotate x_{1}60 degrees toward the x_{2}-x_{3}plane or does it mean something else? I tried to rotate x_{1}to the x_{2}-x_{3}plane but I can never be sure of the angle between x_{1}' and x_{2}, and x_{1}' and x_{3}. How do I find the angles?

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# How to form the transformation matrix for this

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