2.60   ODE No. 60

  1. Problem in Latex
  2. Mathematica input
  3. Maple input

y(x)y(x)21x21=0 Mathematica : cpu = 0.0574839 (sec), leaf count = 143

{{y(x)12ec1e4c1(2x2+2x21x1)+2e2c1+2x22x21x1},{y(x)12ec1e4c1(2x2+2x21x1)+2e2c1+2x22x21x1}}

Maple : cpu = 0.021 (sec), leaf count = 29

{ln(x+x21)ln(y(x)+(y(x))21)+_C1=0}

Hand solution

(1)y=±y21x21

Separable. For the positive case

dydx1y21=1x21dy(y21)12=dx(x21)12

Integrating

dy(y21)12=dx(x21)12+C

But dy(y21)12=tanh1y(y21)12=ln(y+y21), hence

ln(y+y21)=ln(x+x21)+C

For the negative case

dydx1y21=1x21dy(y21)12=dx(x21)12

Integrating

dy(y21)12=dx(x21)12+C

But dy(y21)12=tanh1y(y21)12=ln(y+y21), hence

ln(y+y21)=ln(x+x21)+C

Therefore

ln(y+y21)=±ln(x+x21)+C