- #1
Koldstream
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Hey everyone!
This is part of a question on finding minima,maxima and saddle points in multi variable functions.
In this section i need to solve the differential equations:
[tex]y^{3}+3x^{2}y-y[/tex] [1]
[tex]x^{3}+3y^{2}x-x[/tex] [2]
---
i divide [1] through by y and [2] through by x.
In doing so i am pretty sure i am losing a solution, but i don't know how to solve it in any other way.
Doing this however is get:
x=0.5 y=0.5
x=0.5 y=-0.5
x=-0.5 y=0.5
x=-0.5 y=-0.5
The book says these are correct however it also mentions these solutions:
x=0 y=0
x=0 y=1
x=0 y=-1
x=1 y=0
x=-1 y=0
I suspect i am losing these by dividing through by x and y, but i don't know any other way to solve it.
Could someone show me how to get the other solutions?
Thanks for your time :)
Homework Statement
This is part of a question on finding minima,maxima and saddle points in multi variable functions.
In this section i need to solve the differential equations:
[tex]y^{3}+3x^{2}y-y[/tex] [1]
[tex]x^{3}+3y^{2}x-x[/tex] [2]
Homework Equations
---
The Attempt at a Solution
i divide [1] through by y and [2] through by x.
In doing so i am pretty sure i am losing a solution, but i don't know how to solve it in any other way.
Doing this however is get:
x=0.5 y=0.5
x=0.5 y=-0.5
x=-0.5 y=0.5
x=-0.5 y=-0.5
The book says these are correct however it also mentions these solutions:
x=0 y=0
x=0 y=1
x=0 y=-1
x=1 y=0
x=-1 y=0
I suspect i am losing these by dividing through by x and y, but i don't know any other way to solve it.
Could someone show me how to get the other solutions?
Thanks for your time :)