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Question

Let the function y=f(x) satisfies the differential equation x2dydx=y2e1/x (x0) and limx0f(x)=1. Identify the CORRECT statement(s) ?

A
Range of f is (0,1){12}
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B
f(x) is bounded
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C
limx0+f(x)=1
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D
e0f(x) dx>10f(x) dx
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Solution

The correct options are
A Range of f is (0,1){12}
B f(x) is bounded
D e0f(x) dx>10f(x) dx
x2dydx=y2e1x
dyy2=e1xx2dx
Integrating both sides,
dyy2=e1xx2dx
1y=e1x+C
Given, limx0f(x)=1
1=0+CC=1
1y=e1x1
y=11+e1x

dydx=e1xx2(1+e1x)2
dydx>0 xR{0}
limx±11+e1x=12
and limx0+11+e1x=0
limx011+e1x=1

Graph of the function is

Clearly, f(x)>0 for all xDf
e0f(x) dx>10f(x) dx

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