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Q.

Let x = x(y) be the solution of the differential equation 
2(y+2)loge(y+2)dx+x+42loge(y+2)dy=0,y>1
with x(e4 - 2) = 1. Then x(e9 - 2) is equal to

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a

32/9

b

4/9

c

3

d

10/3

answer is B.

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Detailed Solution

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2(y+2)loge(y+2)dx+x+42loge(y+2)dy=0dxdy+12(y+2)log(y+2)x=(log(y+2)2)(y+2)log(y+2) I.F=edy2(y+2)log(y+2)   put logy+2=t IF=e12tdt=t=log(y+2)xlog(y+2)=(log(y+2)2)(y+2)log(y+2)log(y+2)dy= =(log(y+2)2)(y+2)log(y+2)dy==t2tdt. =23t324t+c =23(log(y+2))324(log(y+2))12+c if xe42=1 then c=143  Then xe92=329

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