An orthogonal matrix is

1.	An orthogonal matrix is
A.	\[\left[ \begin{matrix} \cos \alpha & 2\sin \alpha \\ -2\sin \alpha & \cos \alpha \\ \end{matrix} \right]\]
B.	\[\left[ \begin{matrix} \cos \alpha & \sin \alpha \\ -\sin \alpha & \cos \alpha \\ \end{matrix} \right]\]
C.	\[\left[ \begin{matrix} \cos \alpha & \sin \alpha \\ \sin \alpha & \cos \alpha \\ \end{matrix} \right]\]
D.	\[\left[ \begin{matrix} 1 & 1 \\ 1 & 1 \\ \end{matrix} \right]\]
Answer» C. \[\left[ \begin{matrix} \cos \alpha & \sin \alpha \\ \sin \alpha & \cos \alpha \\ \end{matrix} \right]\]

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An orthogonal matrix is

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