Integrating Factor Method Problem

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SUMMARY

The discussion centers on solving the differential equation cos(x)y' + (sin(x))y = 1. The user correctly transformed the equation into the standard linear form y' + (tan(x))y = sec(x) by dividing through by cos(x). However, the user failed to apply the integrating factor correctly to the right-hand side during integration, leading to an incorrect solution. The correct general solution is y = sin(x) + Ccos(x), as stated in the textbook.

PREREQUISITES
  • Understanding of first-order linear differential equations
  • Knowledge of integrating factors in differential equations
  • Familiarity with trigonometric identities and functions
  • Basic algebraic manipulation skills
NEXT STEPS
  • Study the method of integrating factors in first-order linear differential equations
  • Practice solving differential equations involving trigonometric functions
  • Review algebraic simplification techniques in calculus
  • Explore the implications of the general solution in the context of initial value problems
USEFUL FOR

Students studying differential equations, mathematics educators, and anyone looking to improve their skills in solving linear differential equations with trigonometric components.

bdh2991
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Homework Statement



Find the general solution of the given differential equation cosxy'+(sinx)y=1



The Attempt at a Solution



I divided everything by cosx and got : y'+(tanx)y=secx

then after doing e to the integral of tanx i got : ∫d/dx[secx*y]=∫secx

after integrating and simplifying i got y= ln|secx+tanx|/secx + Ccosx

the answer in the book is y= sinx + Ccosx

the weakest part of my math is simplifying (or algebra) what did i do wrong or what do i need to do?
 
Physics news on Phys.org
When you multiplied by the integrating factor, you forgot to do it to the righthand side of the equation.
 

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