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JEE Main 202329 JanuaryMorning Shift
Exam
JEE Main
Year
2023
Date
29 January
Shift
Morning Shift
Subject
Mathematics
Chapter
Differential Equations

JEE Main 2023 · 29 January · Morning Shift · Mathematics · Differential Equations

Let y = f ( x ) be the solution of the differential equation y ( x...

Let y=f(x)y = f ( x ) be the solution of the differential equation y(x+1)dx−x2dy=0,y(1)=ey ( x + 1 ) dx - {x}^{2}dy = 0, y ( 1 ) = e. Then lim⁡x→0+f(x)\lim_{x \to {0}^{+}}f ( x ) is equal to

Options

  1. A00
  2. B

    1e\dfrac{1}{e}

  3. Ce2{e}^{2}
  4. D1e2\dfrac{1}{{e}^{2}}

Correct answer

A. 00

Step-by-step solution

Given,

y(x+1)dx−x2dy=0y ( x + 1 ) dx - x^{2}dy = 0

⇒x+1x2dx=dyy⇒ \dfrac{x + 1}{x2}dx = \dfrac{dy}{y}

⇒(1x+1x2)dx=dyy⇒ \left(\dfrac{1}{x} + \dfrac{1}{x2}\right)dx = \dfrac{dy}{y}

Now integrating both side we get,

log⁡ex−1x=log⁡ey+c\log_{e}x - \dfrac{1}{x} = \log_{e}y + c

Now on using~y(1)=ey\left(1\right) = e~we get,& c=−2c = - 2

So, the equation of curve becomes~log⁡ex−1x=log⁡ey−2\log_{e}x - \dfrac{1}{x} = \log_{e}y - 2

⇒y=eln⁡x−1x+2⇒ y = e^{\ln x} - \dfrac{1}{x} + 2

Hence,~lim⁡x→0+eln⁡x−1−1x+2=e−∞=0\lim_{x \to {0}^{+}}e^{\ln x - 1} - \dfrac{1}{x} + 2= e^{- \infty}= 0.

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