JEE Math Practice Question
The number of distinct real roots of $$\left| {\begin{matrix} {\sin x} & {\cos x} & {\cos x} \\ {\cos x} & {\sin x} & {\cos x} \\ {\cos x} & {\cos x} & {\sin x} \\ \end{matrix} } \right| = 0$$ in the interval $$ - {\pi \over 4} \le x \le {\pi \over 4}$$ is :
- A.4
- B.1
- C.2
- D.3
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