12th Class
Mathematics
Sample Paper
Maths Olympiad Model Paper-1
question_answer
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 \[-\frac{\pi }{4}\underline{<}\,\,x\,\,\underline{<}\frac{\pi }{4}\] is :