How to Integrate Complex Functions Like ∫(sec(x^2))(e^cot(x))dx?

  • Context: Undergrad 
  • Thread starter Thread starter dasboot58
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Discussion Overview

The discussion revolves around the integration of complex functions, specifically the integrals ∫(sec(x^2))(e^cot(x))dx and ∫(9x^3/√(1+x^2))dx, with a focus on substitution methods and integration techniques. Participants express confusion and seek assistance in solving these problems.

Discussion Character

  • Homework-related
  • Exploratory
  • Debate/contested

Main Points Raised

  • Some participants suggest that the original poster (OP) should provide their attempts at solving the problems to facilitate better assistance.
  • There is a mention of using substitution, specifically x = tan(x), for the second integral.
  • One participant questions whether the assumption that x is real is valid for the integrals being discussed.
  • Another participant raises the possibility of using integration by parts but expresses doubt about its applicability to the first integral.
  • Several participants express frustration over the OP's lack of provided work and the urgency of their requests for help.
  • One participant mentions having multiple approaches that led to incorrect answers, indicating a struggle with the problems.

Areas of Agreement / Disagreement

Participants generally agree that the OP needs to show their work for better guidance, but there is no consensus on the best approach to solve the integrals. Multiple competing views on techniques and assumptions remain unresolved.

Contextual Notes

Some participants note the importance of understanding exponential integrals, but the discussion lacks clarity on specific mathematical steps or assumptions that may be necessary for solving the integrals.

dasboot58
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<< Moderator's Note -- Original post (OP) restored after being deleted by the poster >> PLEASE HELP! Does anyone possible know how to do these two problems! I'm freaking out!

∫(secx^2)(e^cotx)dx

Thank you so much!

PLEASE HELP! Does anyone possible know how to do these two problems! I'm freaking out!

∫(secx^2)(e^cotx)dx

And∫9x^3/Square root of (1+x^2) dx NEED TO USE SUBSTITUTION X=TanxThank you so much!
 
Last edited by a moderator:
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Urgent!

These seem like homework problems...
Please post an attempt at the problem, and this should be in the homework section,
Cheers,
 
No these are review questions I'm stuck on. All my answers are wrong. Everything doesn't make sense but apparently there is an answer to this.
 
Urgent!

When I get home I will attempt to solve them. Could you post yours steps so that we can see where you may have gone wrong?

See the FAQ for how to use latex.
 
Is there a model forum? I can take a picture with my phone. I have about 20 different approaches all leading to THE WRONG ANSWER! When I graph it comes close but not it. I asked my old math professor and he doesn't know. Think he should get fired but that's a different story.
 
Post what you think is your best attempt.
 
I figured this one out! Can you help me with the other?
 
Last edited:
dasboot58 said:
I figured this one out! Can you help me with the other?

I only saw one problem, I can't see your other one. I can't see your work, this is the wrong location. Also, naming a posting urgent is a bad way to get help here.

As far as the one I can see. Are we assuming x is real? Do you know about exponential integrals?
 
Student100 said:
I only saw one problem, I can't see your other one. I can't see your work, this is the wrong location. Also, naming a posting urgent is a bad way to get help here.

As far as the one I can see. Are we assuming x is real? Do you know about exponential integrals?

I edited the post. I do have a basic knowledge. I've done a lot of problems similar to this. With this one, I honestly have no idea how to begin..
 
  • #10
dasboot58 said:
I edited the post. I do have a basic knowledge. I've done a lot of problems similar to this. With this one, I honestly have no idea how to begin..

Are you trying to do it by parts? What is your u and v?
 
  • #11
Student100 said:
Are you trying to do it by parts? What is your u and v?

I don't think you can do it by parts. I'm guessing U would be secx^2 and ∫dv=∫e^cotx
 
  • #12
Thread closed temporarily for Moderation...
 
  • #13
Thread will stay closed.

@dasboot58 -- Check your PMs. You've broken at least a half-dozen of the PF rules with this thread.

For everybody else, please report threads where the OP shows no work. Thank you.
 

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