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Question

Let y=y(x) be the solution of the differential equation dydx=1+xeyx, 2<x<2, y(0)=0, then the minimum value of y(x), x(2,2) is equal to

A
(2+3)+loge2
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B
(1+3)loge(31)
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C
(13)loge(31)
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D
(23)loge2
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Solution

The correct option is C (13)loge(31)
dydx=1+xeyx
eydydx=ey+xex
Let
ey=teydydx=dtdxdtdx=t+xex
dtdx+t=xex
Integrating function e1dx=ex
Solution is : tex=xex.exdx
tex=x22+c
exy=x22+c
y(0)=0c=1
exy=1x22y(x)=xlog(1x22)
Now y(x)=111x22(0x)
=2x2+2x2x2
=(x1)23x22
y(x)=0x=1±3

x(2,2) x=13 is point of local minima
Minimum value of y(x)=y(13)
=(13)loge(1(13)22)
=(13)loge(31)

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