JEE Main & Advanced JEE Main Paper (Held On 10 April 2016)

  • question_answer
    \[\underset{x\to 0}{\mathop{\lim }}\,\frac{{{(1-\cos 2x)}^{2}}}{2x\ \tan x-x{{\tan }^{2}}x}\]is   JEE Main Online Paper (Held On 10 April 2016)

    A) \[2\]                                               

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

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

    D) \[-2\]

    Correct Answer: A

    Solution :

                 \[\frac{{{(2{{\sin }^{2}}x)}^{2}}}{x\left[ x\left( x-\frac{{{x}^{3}}}{3}+\frac{2{{x}^{5}}}{15}...... \right)-\left( 2x-\frac{8{{x}^{3}}}{3}...... \right) \right]}\]              \[=\frac{4{{\sin }^{4}}x}{{{x}^{4}}\left[ -\frac{2}{3}+\frac{8}{3} \right]}=\frac{4}{2}=2\]


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