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$-\frac{\pi}{4} \leq x \leq \frac{\pi}{4}$ અંતરાલમાં $\left|\begin{array}{lll}\sin x & \cos x & \cos x \\ \cos x & \sin x & \cos x \\ \cos x & \cos x & \sin x\end{array}\right|=0$ ના વાસ્તવિક ભિન્ન બીજની સંખ્યા મેળવો.