(1+e^x)dy=ydx
dy/y=dx/(1+e^x)
dy/y=d(e^x)/[(1+e^x)e^x]
dy/y=d(e^x)[1/e^x-1/(e^x+1)]
lny+c=ln(e^x)-ln(e^x+1)
y+c1=e^x/(e^x+1)
y=e^x/(e^x+1)+c
(1+e^x)dy=ydx
dy/y=dx/(1+e^x)
dy/y=d(e^x)/[(1+e^x)e^x]
dy/y=d(e^x)[1/e^x-1/(e^x+1)]
lny+c=ln(e^x)-ln(e^x+1)
y+c1=e^x/(e^x+1)
y=e^x/(e^x+1)+c