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