JEE Main & Advanced Mathematics Definite Integration Question Bank Fundamental definite integration, Definite integration by substitution

  • question_answer
    \[\int_{0}^{1}{\frac{{{e}^{x}}(x-1)}{{{(x+1)}^{3}}}\,dx=}\]                                             [SCRA 1986]

    A)                 \[\frac{e}{4}\]  

    B)                 \[\frac{e}{4}-1\]

    C)                 \[\frac{e}{4}+1\]             

    D)                 None of these

    Correct Answer: B

    Solution :

               \[\int_{0}^{1}{\frac{{{e}^{x}}(x-1)}{{{(x+1)}^{3}}}}dx=\int_{0}^{1}{\frac{{{e}^{x}}(x+1-2)}{{{(x+1)}^{3}}}\,}dx\]                                 \[\int_{0}^{1}{\frac{{{e}^{x}}}{{{(x+1)}^{2}}}}dx-2\int_{0}^{1}{\frac{{{e}^{x}}}{{{(x+1)}^{3}}}}dx=\left[ \frac{{{e}^{x}}}{{{(x+1)}^{2}}} \right]_{0}^{1}=\frac{e}{4}-1\].


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