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1)
![(1+y)dx-(1-x)dy=0 (1+y)dx-(1-x)dy=0](https://tex.z-dn.net/?f=%281%2By%29dx-%281-x%29dy%3D0)
![(1-x)dy=(1+y)dx (1-x)dy=(1+y)dx](https://tex.z-dn.net/?f=%281-x%29dy%3D%281%2By%29dx)
![\frac{dy}{1+y} = \frac{dx}{1-x} \frac{dy}{1+y} = \frac{dx}{1-x}](https://tex.z-dn.net/?f=+%5Cfrac%7Bdy%7D%7B1%2By%7D+%3D+%5Cfrac%7Bdx%7D%7B1-x%7D+)
![\int \frac{dy}{1+y} =\int \frac{dx}{1-x} \int \frac{dy}{1+y} =\int \frac{dx}{1-x}](https://tex.z-dn.net/?f=%5Cint+%5Cfrac%7Bdy%7D%7B1%2By%7D+%3D%5Cint+%5Cfrac%7Bdx%7D%7B1-x%7D+)
![\int \frac{d(1+y)}{1+y} =-\int \frac{d(1-x)}{1-x} \int \frac{d(1+y)}{1+y} =-\int \frac{d(1-x)}{1-x}](https://tex.z-dn.net/?f=%5Cint+%5Cfrac%7Bd%281%2By%29%7D%7B1%2By%7D+%3D-%5Cint+%5Cfrac%7Bd%281-x%29%7D%7B1-x%7D+)
![ln(1+y) =-ln(1-x)+C ln(1+y) =-ln(1-x)+C](https://tex.z-dn.net/?f=ln%281%2By%29+%3D-ln%281-x%29%2BC)
![ln(1+y) =-ln(1-x)+ln C ln(1+y) =-ln(1-x)+ln C](https://tex.z-dn.net/?f=ln%281%2By%29+%3D-ln%281-x%29%2Bln+C)
![ln(1+y) =ln(\frac{C}{1-x} ) ln(1+y) =ln(\frac{C}{1-x} )](https://tex.z-dn.net/?f=ln%281%2By%29+%3Dln%28%5Cfrac%7BC%7D%7B1-x%7D+%29)
![1+y =\frac{C}{1-x} 1+y =\frac{C}{1-x}](https://tex.z-dn.net/?f=1%2By+%3D%5Cfrac%7BC%7D%7B1-x%7D)
![y =\frac{C}{1-x}-1 y =\frac{C}{1-x}-1](https://tex.z-dn.net/?f=y+%3D%5Cfrac%7BC%7D%7B1-x%7D-1)
2)
![(1+x)ydx-(1-y)xdy=0 (1+x)ydx-(1-y)xdy=0](https://tex.z-dn.net/?f=%281%2Bx%29ydx-%281-y%29xdy%3D0)
![\frac{(1-y)dy}{y} =\frac{(1+x)dx }{x} \frac{(1-y)dy}{y} =\frac{(1+x)dx }{x}](https://tex.z-dn.net/?f=%5Cfrac%7B%281-y%29dy%7D%7By%7D+%3D%5Cfrac%7B%281%2Bx%29dx+%7D%7Bx%7D)
![\int\frac{(1-y)dy}{y} =\int\frac{(1+x)dx }{x} \int\frac{(1-y)dy}{y} =\int\frac{(1+x)dx }{x}](https://tex.z-dn.net/?f=%5Cint%5Cfrac%7B%281-y%29dy%7D%7By%7D+%3D%5Cint%5Cfrac%7B%281%2Bx%29dx+%7D%7Bx%7D)
![\int\frac{dy}{y} -\int \frac{ydy}{y} =\int \frac{dx}{x} +\int \frac{xdx}{x} \int\frac{dy}{y} -\int \frac{ydy}{y} =\int \frac{dx}{x} +\int \frac{xdx}{x}](https://tex.z-dn.net/?f=%5Cint%5Cfrac%7Bdy%7D%7By%7D+-%5Cint+%5Cfrac%7Bydy%7D%7By%7D+%3D%5Cint+%5Cfrac%7Bdx%7D%7Bx%7D+%2B%5Cint+%5Cfrac%7Bxdx%7D%7Bx%7D+)
![\int\frac{dy}{y} -\int dy =\int \frac{dx}{x} +\int dx \int\frac{dy}{y} -\int dy =\int \frac{dx}{x} +\int dx](https://tex.z-dn.net/?f=%5Cint%5Cfrac%7Bdy%7D%7By%7D+-%5Cint+dy+%3D%5Cint+%5Cfrac%7Bdx%7D%7Bx%7D+%2B%5Cint+dx)
![ln y -y =lnx +x+ C ln y -y =lnx +x+ C](https://tex.z-dn.net/?f=ln+y+-y+%3Dlnx+%2Bx%2B+C)
![ln y -ln(e^y) =lnx +ln(e^x)+ln C ln y -ln(e^y) =lnx +ln(e^x)+ln C](https://tex.z-dn.net/?f=ln+y+-ln%28e%5Ey%29+%3Dlnx+%2Bln%28e%5Ex%29%2Bln+C)
![ln \frac{y}{e^y} =ln(Cxe^x) ln \frac{y}{e^y} =ln(Cxe^x)](https://tex.z-dn.net/?f=ln++%5Cfrac%7By%7D%7Be%5Ey%7D+%3Dln%28Cxe%5Ex%29)
![\frac{y}{e^y} =Cxe^x \frac{y}{e^y} =Cxe^x](https://tex.z-dn.net/?f=%5Cfrac%7By%7D%7Be%5Ey%7D+%3DCxe%5Ex)
3)
![(1+y^2)dx- \sqrt{x} dy=0 (1+y^2)dx- \sqrt{x} dy=0](https://tex.z-dn.net/?f=%281%2By%5E2%29dx-+%5Csqrt%7Bx%7D+dy%3D0)
![\frac{dy}{1+y^2} = \frac{dx}{ \sqrt{x} } \frac{dy}{1+y^2} = \frac{dx}{ \sqrt{x} }](https://tex.z-dn.net/?f=+%5Cfrac%7Bdy%7D%7B1%2By%5E2%7D+%3D+%5Cfrac%7Bdx%7D%7B+%5Csqrt%7Bx%7D+%7D+)
![\int \frac{dy}{1+y^2} = \int\frac{dx}{ \sqrt{x} } \int \frac{dy}{1+y^2} = \int\frac{dx}{ \sqrt{x} }](https://tex.z-dn.net/?f=%5Cint+%5Cfrac%7Bdy%7D%7B1%2By%5E2%7D+%3D+%5Cint%5Cfrac%7Bdx%7D%7B+%5Csqrt%7Bx%7D+%7D+)
![arctg(y)=2\sqrt{x}+C arctg(y)=2\sqrt{x}+C](https://tex.z-dn.net/?f=arctg%28y%29%3D2%5Csqrt%7Bx%7D%2BC)
![y=tg(2\sqrt{x}+C) y=tg(2\sqrt{x}+C)](https://tex.z-dn.net/?f=y%3Dtg%282%5Csqrt%7Bx%7D%2BC%29)
![tg(2\sqrt{0}+C)=1 tg(2\sqrt{0}+C)=1](https://tex.z-dn.net/?f=tg%282%5Csqrt%7B0%7D%2BC%29%3D1)
![tg(C)=1 tg(C)=1](https://tex.z-dn.net/?f=tg%28C%29%3D1)
![C= \frac{ \pi }{4} C= \frac{ \pi }{4}](https://tex.z-dn.net/?f=C%3D+%5Cfrac%7B+%5Cpi+%7D%7B4%7D+)
![y=tg(2\sqrt{x}+ \frac{ \pi }{4}) y=tg(2\sqrt{x}+ \frac{ \pi }{4})](https://tex.z-dn.net/?f=y%3Dtg%282%5Csqrt%7Bx%7D%2B+%5Cfrac%7B+%5Cpi+%7D%7B4%7D%29)
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