Let \( f(x)=\left|\begin{array}{ccc}\cos x & \sin x & \cos x \\ \co... VIDEO
Let \( f(x)=\left|\begin{array}{ccc}\cos x & \sin x & \cos x \\ \cos 2 x & \sin 2 x & 2 \cos 2 x \\ \cos 3 x & \sin 3 x & 2 \cos 3 x\end{array}\right| \). Then find thehttps://bit.ly/YTAI_PWAP https://www.pw.live
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