
#1
Feb412, 06:23 AM

P: 1

Hi there,
This ode has me really stumped. Since it is non linear, I don't know which method to use for this: [tex]xy' + 2y = \frac{sec^2(y)}{x}[/tex] Thank you :) 



#2
Feb1112, 05:03 AM

P: 52

There are two hints that may be useful (or not).
[itex]\frac{d(tan(y))}{dy}=?[/itex] [itex]\frac{d(x^2 y)}{dx}=?[/itex] 



#3
Feb1312, 08:22 PM

PF Gold
P: 3,173





#4
Feb1412, 05:49 AM

P: 52

ODE Approaching the expicit solution
This small hints aren't supposed to make the DE separable. They are just things i noticed when looking to the DE, things that beginners usually dont notice, and that may put him (or her) one step closer to the solution, as we aren't supposed to give straightaway answers or hints that make they work too easy.




#5
Feb1512, 07:12 AM

P: 744

Hello !
I don't think that the ODE can be analytically solved in using only standard functions. So, I strongly suggest to use numerical methods instead of searching an explicit solution. Nevertheless, approximate analytic solutions can be obtained, depending on the range where they are derived. An example is given in attachment. 


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