If $f\left(x\right)\left|\cos \left(2x\right)\cos \left(2x\right)\text{sin}\left(2x\right)-\cos x\cos x-\sin x\sin x\sin x\cos x\right|,then:$$f^{prime}\left(x\right)=0$at exactly three point in $\left(-\pi ,\pi \right)$$f^{prime}\left(x\right)=0$at more than three point in $\left(-\pi ,\pi \right)$$f\left(x\right)$attains its maximum at $x=0$$f\left(x\right)$attains its minimum at $x=0$

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