Answer to Question #190528 in Differential Equations for Samiullah Jan

Question #190528

2ty/t^2+1 -2t(2-ln(t^2+1))y'=0​


1
Expert's answer
2021-05-07T14:39:09-0400

Given,

(4+t2)dydt+2ty=4t(4+t^2)\dfrac{dy}{dt}+2ty=4t


dy2y=2tdt4+t2\\[9pt] \dfrac{dy}{2-y}=\dfrac{2tdt}{4+t^2}


Integrating Both the sides-


ln(2y)=ln(t2+4)+lnc1orc=2yt24So,y=2ct2+4=2t2+8ct2+4-ln(2-y)=ln(t^2+4)+ln c_1 \\[9pt] or c=\dfrac{2-y}{t^2}{4}\\[9pt] So ,y=2-\dfrac{c}{t^2+4}=\dfrac{2t^2+8-c}{t^2+4}


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