Answers: 1
![\dfrac{\mathrm d}{\mathrm dx}[(1+x^2)y]=(1+x^2)\dfrac{\mathrm dy}{\mathrm dx}+2xy](/tpl/images/0330/5912/57c50.png)
![\dfrac{\mathrm d}{\mathrm dx}[(1+x^2)y]=4x^2](/tpl/images/0330/5912/4486d.png)
yields
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(1+x^2)dy/dx+2xy-4x^2=0 bu using bernoulli's equation...
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