JEE Main & Advanced Sample Paper JEE Main - Mock Test - 35

  • question_answer
    If \[\tan (\sin x)=\cot (\sin x),\] \[x\in [0,\,2\pi ],\] then number of such values of x is                                               

    A) \[1\]

    B)        \[2\]

    C) \[3\]

    D)        \[4\]

    Correct Answer: D

    Solution :

    [d] \[\tan \,\,(\sin x)=\tan \left( \frac{\pi }{2}-\sin x \right)\] \[\therefore \,\,\sin x=\frac{\pi }{2}-\sin x+n\pi ,\,n\in I\] \[\Rightarrow \,\,\sin x=\frac{\pi }{4}+\frac{n\pi }{2},n\in I\] \[\Rightarrow \,\,\sin x=\frac{\pi }{4}\] or \[-\frac{\pi }{4}\] as             \[\left| \frac{n\pi }{2}+\frac{\pi }{4} \right|>1\forall n\in I-\{-1,0\}\] Hence, there will be one value of x in each quadrant.


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