- #1

ahmed markhoos

- 49

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< Mentor Note -- thread moved to HH from the technical math forums, so no HH Template is shown >

Hello,

I have a problem with rotation matrices, its just a comparison problem. Θ must be 240 or -120, I don't know how the book show the answer like that, these are the two matrices

\begin{array}--1/2&\sqrt{(3)}/2\\-\sqrt{(3)}/2&-1/2\end{array}

with

\begin{array}ccosΘ&-sinΘ\\sinΘ&cosΘ\end{array}

- I tried to take element 1,1 and 2,1 , it gives 120 & -60. How is that suppose to be 240 or -120?

Hello,

I have a problem with rotation matrices, its just a comparison problem. Θ must be 240 or -120, I don't know how the book show the answer like that, these are the two matrices

\begin{array}--1/2&\sqrt{(3)}/2\\-\sqrt{(3)}/2&-1/2\end{array}

with

\begin{array}ccosΘ&-sinΘ\\sinΘ&cosΘ\end{array}

- I tried to take element 1,1 and 2,1 , it gives 120 & -60. How is that suppose to be 240 or -120?

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