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Given that $q_1$ and $q_2$ are known quaternions.

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    $\begingroup$ It looks like you're trying to find the quaternion that performs a particular spatial rotation. Is that correct? $\endgroup$ – Adrian Keister Jan 25 at 21:38
  • $\begingroup$ The rotation about unit vector $u_x\mathbf{i}+u_y\mathbf{j}+u_z\mathbf{k}$ through an angle $\theta$ corresponds to the quaternion $\mathbf{q}=\cos(\theta/2)+(u_x\mathbf{i}+u_y\mathbf{j}+u_z\mathbf{k})\,\sin(\theta/2)$. $\endgroup$ – Adrian Keister Jan 25 at 21:42
  • $\begingroup$ I'd like to find a quaternion that rotates q1 so it matches q2. The actual problem I was trying to solve is in this thread: math.stackexchange.com/questions/3087370/… $\endgroup$ – Övünç Tüzel Jan 25 at 23:35
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    $\begingroup$ Possible duplicate of Finding the Quaternion that rotates a coordinate system to match another. You didn't really have to make a new contextless question. $\endgroup$ – rschwieb Jan 26 at 13:50

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