What Are the Correct u and du Values for These Trig Substitution Problems?

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SUMMARY

The discussion focuses on determining the correct u and du values for three specific integral problems involving trigonometric substitution. The integrals presented are: 1) ∫[e^x/(e^x +1)] dx, 2) ∫[1/(e^2x +1)] dx, and 3) ∫[(1+x)/(1+x^2)] dx. Participants emphasize the importance of showing prior work and suggest breaking down the third integral into two separate integrals for easier handling. The hints provided include differentiation rules and algebraic manipulation techniques relevant to integration.

PREREQUISITES
  • Understanding of basic calculus concepts, specifically integration techniques.
  • Familiarity with trigonometric substitution methods in calculus.
  • Knowledge of differentiation rules, particularly for exponential functions.
  • Ability to manipulate algebraic expressions for integration purposes.
NEXT STEPS
  • Study integration techniques involving trigonometric substitution in depth.
  • Practice solving integrals that require u-substitution, focusing on identifying u and du.
  • Explore the method of partial fractions for breaking down complex integrals.
  • Review differentiation rules and their applications in integration problems.
USEFUL FOR

Students studying calculus, particularly those tackling integration problems, as well as educators looking for examples of trigonometric substitution techniques.

qzack96
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I really needed some help with these trig substitution problems. Please write the u and du values for each. I'd really really appreciate it !

1) Integrate [e^x/(e^x +1)] dx

2) Integrate [1/(e^2x +1)] dx

3) Integrate [(1+x)/(1+x^2)] dx

Thank you Again !
 
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I will give you some hints.

d/dx (ex)=ex
d/dx(constant)=0

Can you think of a substitution for the first one?

(am)n= amn

what can you do with the second one now?

For the third, try making two integrals from it.
 
qzack96 said:
Please write the u and du values for each.

Hi qzack96. I see that this is your first post. Welcome! When you post problems, especially homework problems, please try and show us what work you have done so far. It doesn't matter whether it is complete or correct. Post what you have tried or maybe what you try after following rock.freak667's hints.
 

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