Solving a Partial Differential Equation

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Homework Help Overview

The discussion revolves around finding functions y=y(x) that satisfy a specific partial differential equation involving terms like xy' and cot(y). The problem is set within the context of differential equations, particularly focusing on the behavior of solutions in specified intervals.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants explore the use of separation of variables as a potential method for solving the equation. There are questions regarding the integration of terms and the correct formulation of the equation, particularly concerning a coefficient that was initially overlooked.

Discussion Status

The discussion is active, with participants providing hints and engaging in clarifying questions. There is acknowledgment of a mistake in the problem statement, which has led to further exploration of the correct approach to integration.

Contextual Notes

Participants note the importance of correctly identifying terms in the equation and the implications of initial conditions, such as y(x_0) for x_0≠0 and cos(y_0)≠0, which may influence the solution's behavior.

the0
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Homework Statement



Find functions y=y(x) defined on (-∞,0) or (0,+∞) which verify:

xy'+(x2-1)cot(y)=0,
y([itex]x_0{}[/itex])=[itex]y_0{}[/itex] for [itex]x_0{}[/itex]≠0 and cos([itex]y_0{}[/itex])≠0

The Attempt at a Solution



I'm really stuck on this one!
Any help will be very much appreciated!
 
Last edited:
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welcome to pf!

hi the0! welcome to pf! :smile:

hint: separation of variables? :wink:
 
Ok, thanks!
So I get:

xy' = (1-2x2)cot(y)



y'tan(y) = (1-2x2)/x

Then how do I go about integrating the left hand side?
 
the0 said:
y'tan(y) = (1-2x2)/x

(where did that 2 come from? :confused:)

easier if you write it with d's …

tan(y) dy = (1-x2)/x dx :smile:
 
I realized that it was that simple right after I posted it haha
and I missed out the 2 in the original statement of the problem, my mistake, sorry about that.
Thanks a lot!
 
I realized that it was that simple right after I posted it haha
and I missed out the 2 in the original statement of the problem, my mistake, sorry about that.
Thanks a lot!
 

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