JEE Main & Advanced Mathematics Functions Question Bank Limits

  • question_answer
    If \[f(x)=\left\{ \begin{align}   & \sin x,x\ne n\pi ,n\in Z \\  & \,\,\,\,\,\,0,\,\,\text{otherwise} \\ \end{align} \right.\] and \[g(x)=\left\{ \begin{align}   & {{x}^{2}}+1,x\ne 0,\,2 \\  & \,\,\,\,\,\,\,\,4,x=0 \\  & \,\,\,\,\,\,\,\,\,5,x=2 \\ \end{align} \right.\] then \[\underset{x\to 0}{\mathop{\lim }}\,g\{f(x)\}=\] [Karnataka CET 2000]

    A)                 1

    B)                 0

    C)                 \[\frac{1}{2}\]

    D)                 \[\frac{1}{4}\]

    Correct Answer: A

    Solution :

                    \[\underset{x\to 0}{\mathop{\text{lim}}}\,\,g(f(x))=\underset{x\to 0}{\mathop{\text{lim}}}\,\,{{[f(x)]}^{2}}+1=\underset{x\to 0}{\mathop{\text{lim}}}\,\,({{\sin }^{2}}x+1)=1\].


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