ODE problem: 3x^2 y dx + (x^3 + 2y)dy = 0

1. Feb 26, 2006

I have two ODE with which I cannot to slove;

3x2ydx+(x3+2y)dy=0

I tried to change of variable y=v*x, but I still cannot find a way to solve it.

the second is:

(exsin(y)-2ysin(x))dx+(excos(y)+2cos(x))dx=0

here I have no idea

thank you
B

2. Feb 26, 2006

quasar987

They are exact diff equ. Have you not seen how to solve such ode's?

3. Feb 26, 2006

Hurkyl

Staff Emeritus
Surely you know other techniques for solving ODE? This problem is tailor-made for one of them.