JEE Main & Advanced Mathematics Differential Equations Question Bank Variable Separable type differential equations

  • question_answer
    The solution of the differential equation \[x\cos ydy=(x{{e}^{x}}\log x+{{e}^{x}})dx\] is  [DSSE 1988]

    A)                 \[\sin y=\frac{1}{x}{{e}^{x}}+c\]  

    B)                 \[\sin y+{{e}^{x}}\log x+c=0\]

    C)                 \[\sin y={{e}^{x}}\log x+c\]

    D)                 None of these

    Correct Answer: C

    Solution :

                       \[x\cos ydy=(x{{e}^{x}}\log x+{{e}^{x}})dx\]                    Þ \[\cos ydy=\left( {{e}^{x}}\log x+\frac{{{e}^{x}}}{x} \right)\text{ }dx\]                                 On integrating, \[\sin y={{e}^{x}}\log x+c\].


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