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

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

## Answers and Replies

quasar987
Science Advisor
Homework Helper
Gold Member
They are exact diff equ. Have you not seen how to solve such ode's?

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