JEE Main & Advanced Mathematics Limits, Continuity and Differentiability Question Bank Self Evaluation Test - Continuity and Differentiability

  • question_answer
    The function \[f(x)=\sin ({{\log }_{e}}\left| x \right|),x\ne 0\], and 1 if \[x=0\]

    A) Is continuous at \[x=0\]

    B) Has removable discontinuity at \[x=0\]

    C) Has jump discontinuity at \[x=0\]

    D) Has oscillating discontinuity at \[x=0\]

    Correct Answer: D

    Solution :

    [d] We have \[\underset{x\to {{0}^{-}}}{\mathop{\lim }}\,f(x)=\underset{h\to 0}{\mathop{\lim }}\,\sin ({{\log }_{e}}\left| -h \right|)\] \[=\underset{h\to 0}{\mathop{\lim }}\,\sin ({{\log }_{e}}h)\]             Which does not exist but lies between -1 and 1. Similarly, \[\underset{x\to {{0}^{+}}}{\mathop{\lim }}\,f(x)\] lies between -1 and 1 but cannot be determined.


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