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If $A=\left[\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right]$, then which of the following statements is not correct ?
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The correct answer is:
$A$ is not invertible
$|A|=1 \neq 0$, therefore $A$ is invertible.
Thus (4) is not correct.
Thus (4) is not correct.
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