Jee Main
Matrices And Determinants
JEE Main 2021 (Online) 25th July Evening Shift
MCQ+4 / -12021
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 :
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 :