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यदि $A =\left[\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right]$ तो सहखंडन $A$ है :

• A
  $\left[\begin{array}{cc}\cos \theta & -\sin \theta \\ \cos \theta & \sin \theta\end{array}\right]$
• B
  $\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$
• ✓
  $\left[\begin{array}{cc}\cos \theta & \sin \theta \\ -\sin \theta & \cos \theta\end{array}\right]$
• D
  $\left[\begin{array}{cc}-1 & 0 \\ 0 & -1\end{array}\right]$