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Question

Solve: (1+y2)dxdy+x=etan1y

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Solution

Given,

(1+y2)dxdy+x=etan1y

dxdy+11+y2x=etan1y1+y2

dxdy+Px=Q

P=11+y2I.F=ePdy=e11+y2dyI.F=etan1y

Q=etan1y1+y2

x×I.F=Q×I.Fdy

x×etan1y=etan1y1+y2etan1ydy

xetan1y=11+y2dy

xetan1y=etan1y+c

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