Free counters!

Sunday, July 20, 2014

Separation of Variables, 18

Category: Differential Equations

"Published in Newark, California, USA"

Find the general solution for


Solution:

Consider the given equation above 


Transfer all the terms from the right side of the equation to the left side of the equation and group as follows


 

In order to separate dx and dy from other variables, divide both sides of the equation by (1 - y²)(1 + x²) as follows
 
 


Integrate both sides of the equation, we have




Next, we need to solve for the value of A and B by partial fractions as follows



Equate the coefficients for y, we have



Equate the coefficients for y0, we have 





Substitute the value of A and B to the above equation, we have









Take the inverse natural logarithm on both sides of the equation, we have


  
 
 



where D = C².

Therefore, the general solution is