The number of distinct real roots of the equation,
\left| {\matrix{
{\cos x} & {\sin x} & {\sin x} \cr
{\sin x} & {\cos x} & {\sin x} \cr
{\sin x} & {\sin x} & {\cos x} \cr
} } \right| = 0 in the interval is :
JEE Main 2016 · 9 Apr, Morning shift · Q4442