If this were 2D it would be easy for me, but it isn't 2D and this is
making me use up my scratch paper to no purpose...

If you have a line (line segment? maybe) with a known length, starting
at a known set of coordinates, which is then rotated around those
coordinates by arbitrary amounts around the x and z axes, how do you
calculate the coordinates of the other end of the line?

-Xplo

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