JEE Main & Advanced Mathematics Differentiation Question Bank Self Evaluation Test - Limits and Derivatives

  • question_answer
    What is \[\underset{x\to 0}{\mathop{\lim }}\,\frac{\sin 2x+4x}{2x+\sin 4x}\] equal to?

    A) 0

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

    C) 1

    D) 2

    Correct Answer: C

    Solution :

    [c] \[\underset{x\to 0}{\mathop{\lim }}\,\frac{\sin 2x+4x}{2x+\sin 4x}=\underset{x\to 0}{\mathop{\lim }}\,\frac{\frac{\sin 2x}{x}+4}{2+\frac{\sin 4x}{x}}\] \[=\underset{x\to 0}{\mathop{\lim }}\,\frac{2\left( \frac{\sin 2x}{2x} \right)+4}{2+4\left( \frac{\sin 4x}{4x} \right)}\] Applying limit, we get \[\frac{2+4}{2+4}=1\]


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