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Q.

Let y(x) be the solution of the differential equation (x log x)dydx+y=2x logx, (x 1). Then y(e) is equal to

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a

2

b

2e

c

e

d

0

answer is C.

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Detailed Solution

x log xdydx+y=2x log x

dividing by x log x we get

 dydx+yx log x=2I.F=e1x log xdx=elog(log x)=log x d(I.F.y)= 2log x dx   

By integrating 

 y log x= 2 log x dx y log x=2x log xPut x=1, we get0=210-1+cc=2 y log x=2x(log x) at x=e         y=2

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