Check general solution to ODE please

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SUMMARY

The discussion centers on finding the general solution to the ordinary differential equation (ODE) y'(x) = sec²(3x + 1). The correct approach involves integrating the function, leading to the solution y = (1/3)tan(3x + 1) + C, where C is the constant of integration. Participants confirm that the methodology of integration is valid and emphasize the importance of verifying the solution through differentiation. A rule of thumb for integrating sec² functions is provided, stating that ∫sec²(αx + b)dx = (1/α)tan(αx + b).

PREREQUISITES
  • Understanding of ordinary differential equations (ODEs)
  • Knowledge of integration techniques, specifically for trigonometric functions
  • Familiarity with the secant and tangent functions in calculus
  • Ability to differentiate functions to verify solutions
NEXT STEPS
  • Study integration techniques for trigonometric functions, focusing on sec² and tan
  • Learn about the properties of ordinary differential equations and their solutions
  • Explore the concept of integrating factors in ODEs
  • Practice verifying solutions through differentiation in calculus
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Students and educators in mathematics, particularly those studying calculus and ordinary differential equations, as well as anyone seeking to improve their integration skills and understanding of trigonometric functions.

Lengalicious
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Ok I'm new to ODE's so yeh, just to double check here's what I've done:

Question: Find the general solution to the following differential equation:
Equation: y'(x) = sec2 (3x + 1)

My answer: Don't I just integrate? So dy/dx = sec2 (3x + 1)

then, y = sec2 (3x + 1) dx

so y = (tan(3x+1))/3
 
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Why not check it yourself- differentiate that function!
 
Lengalicious said:
Ok I'm new to ODE's so yeh, just to double check here's what I've done:

Question: Find the general solution to the following differential equation:
Equation: y'(x) = sec2 (3x + 1)

My answer: Don't I just integrate? So dy/dx = sec2 (3x + 1)

then, y = sec2 (3x + 1) dx

so y = (tan(3x+1))/3


don't forget +C
 
xplosiv3s said:
don't forget +C

Ah of course, thanks =)
 
HallsofIvy said:
Why not check it yourself- differentiate that function!

I wasn't worried as to whether my integration was wrong I was worried as to whether my methodology was wrong or not.
 
Lengalicious said:
I wasn't worried as to whether my integration was wrong I was worried as to whether my methodology was wrong or not.

Yes, you are correct but what he said will help verify wether your methodology is correct or not, because an appropriorate one would of course lead to the correct solution :)

as a rule of thumb:

when y=sec2(αx+b) and you want to find the integral:

then ∫sec2(αx+b)dx = 1/α*tan(αx+b)
 

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