- #1

1MileCrash

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Say I rotate the whole system 30 degrees, so that the angle between a and a' is 30 degrees.

Then I make another rotation so that this plane of rotation is perpendicular to that of the old one.

What is the angle between a and a' now?

I am trying to find the angles to use in a tensor transformation law, but I am having problems understanding what the angles will be between the old and new axes when a transformation isn't just a single rotation in one plane of the system.

Tia