1. /(yy+1)dx
2. dy/yy+1=-2xdx/sqrt(2-xx)
3. dy/yy+1=-2xdx/sqrt(4(0,5-0,25xx))
4. dy/yy+1=-2xdx/2sqrt(0,5-0,25xx)
5. dy/yy+1=-xdx/sqrt(0,5-0,25xx)
6. dy/yy+1=0,5d(0,5-0,25xx)/sqrt(0,5-0,25xx)
7. arctg y=sqrt(0,5-0,25xx)+C
8. arctg y=sqrt(2-xx/4)+C
9. arctg y-sqrt(2-xx/4)=C

v punkte 6 net oshibki u menya?