सरल कीजिए : \[ \cos \theta\left[\begin{array}{cc} \cos \theta & \sin \theta \\ -\sin \theta & \c...
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0सरल कीजिए :
\[
\cos \theta\left[\begin{array}{cc}
\cos \theta & \sin \theta \\
-\sin \theta & \cos \theta
\end{array}\right]+\sin \theta\left[\begin{array}{cc}
\sin \theta & -\cos \theta \\
\cos \theta & \sin \theta
\end{array}\right]
\]
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