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  3. 12th Class
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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 :

    A)  0                                

    B)  2

    C)  1

    D)  3

    E)  None of these

    Correct Answer: C

    Solution :

    Not Available                            


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