1.y=klnx+cy=2=kln1+c=c, c=2y=4=klne+c=k+c, k=4-c=2y=2lnx+2y(2)=2ln2+22. ydy/dx=x ydy=xdx y^2/2=x^2/2+c/2 y^2=x^2+Cf(0)=1, 1=0+c, c=1y^2=x^2+1
