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Study Stuff for MCA Examinations - NIMCET
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The number of distinct real roots of $\left| {\matrix{ {\sin x} & {\cos x} & {\cos x} \cr {\cos x} & {\sin x} & {\cos x} \cr {\cos x} & {\cos x} & {\sin x} \cr } } \right| = 0$ in the interval $ - {\pi \over 4} \le x \le {\pi \over 4}$ is :
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