| cc & - & |= - Vidyadip

Question

$\left|\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right|=$

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Answer

(b) : We have, $\left|\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right|=\cos ^2 \theta+\sin ^2 \theta=1$

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