This looks like it has been rotated by 90 degrees not 120degrees. cosines should

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This looks like it has been rotated by 90 degrees not 120degrees. cosines should not be zero or one for a 120 degreerotation. shouldn't the matrix reflect cos 30 degrees insteadof zero? ref is classical dynamics of particles and systemsthornton and marion ed 5, problem 1-3. find thetransformation matrix that rotates a rectangular coordinate systemthrough an angle of 120 degrees about an axis that makes equalangles with the original three coordinate axes. expert answergiven by cramster is 010 001 100 which looks like a 90 degree rotation, not 120 degrees? Nevermind - i got it! This looks like it has been rotated by 90 degrees not 120degrees. cosines should not be zero or one for a 120 degreerotation. shouldn't the matrix reflect cos 30 degrees insteadof zero? ref is classical dynamics of particles and systemsthornton and marion ed 5, problem 1-3. find thetransformation matrix that rotates a rectangular coordinate systemthrough an angle of 120 degrees about an axis that makes equalangles with the original three coordinate axes. expert answergiven by cramster is 010 001 100 which looks like a 90 degree rotation, not 120 degrees? Nevermind - i got it!

Explanation / Answer

Nevermind I got it!

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