Show that this column matrix is not a vector

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The discussion focuses on demonstrating that a column matrix does not behave as a vector under transformation. A rotation matrix composed of Euler angles is mentioned, but deemed not the best approach for the problem. Simplifying the issue to a rotation about the z-axis is suggested as a more effective method. The key point is to analyze the z component and show that applying the rotation results in a different outcome for the third term in the matrix. The conversation emphasizes the need for a clear solution attempt.
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Summary:: I am suppose to show that this columns matrix does not transform as a vector. In another words, it is not in fact a vector.

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I think this become trivial if we get the rotation matrix composed of Euler angles. But, i think that it is not the best way to solve this problem, and i can't find another way.
 
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This is not my area of expertise, but I think you can simplify it to a rotation about the z-axis. That matrix is much simpler. I think you might only need to look at the z component, and show that you get a different result when the rotation is applied to the 3rd term in that array.
 
Moderator's note: Thread moved to homework forum.

@Herculi, please give an attempt at a solution.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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