First Order Differential Equations

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SUMMARY

The discussion focuses on solving the first-order non-linear differential equation given by y' = (y/x) + (2x^3Cos(x^2)/y). Participants highlight that traditional methods such as separation of variables and integrating factors are ineffective for this equation. The recommended approach involves multiplying the equation by y(x) to transform it into a linear form, leading to the substitution y(x)^2 = z(x) for further simplification.

PREREQUISITES
  • Understanding of first-order differential equations
  • Familiarity with non-linear ODEs
  • Knowledge of substitution methods in differential equations
  • Basic calculus concepts, including derivatives and integrals
NEXT STEPS
  • Study the method of substitution for non-linear ODEs
  • Learn about transforming non-linear equations into linear forms
  • Explore the application of integrating factors in differential equations
  • Investigate the properties of first-order differential equations
USEFUL FOR

Students and educators in mathematics, particularly those focused on differential equations, as well as researchers and professionals dealing with non-linear dynamic systems.

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Homework Statement



Solve the following differential equation:

y' = (y/x) + (2x^3Cos(x^2)/y).

Homework Equations





The Attempt at a Solution



You certainly can't separate variables here and you can't put it in the form in which you can find the integrating factor. This is not a Bernoulli equation and neither can it be solved by the y/x = z substitution. I am completely stumped! Please help.
 
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This is a non-linear ODE. To make it linear multiply by y(x) and observe that

y'(x)\,y(x)=\frac{1}{2}\,(y(x)^2)'

and try then the substitution y(x)^2=z(x)
 

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