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

[dasboot58]

<< 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!

 

[Shinaolord]

Urgent!

These seem like homework problems...
Please post an attempt at the problem, and this should be in the homework section,
Cheers,

 

[dasboot58]

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.

 

[Shinaolord]

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.

 

[dasboot58]

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.

 

[Shinaolord]

Post what you think is your best attempt.

 

[dasboot58]

I figured this one out! Can you help me with the other?

 

[Student100]

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?

 

[dasboot58]

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..

 

[Student100]

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?

 

[dasboot58]

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

 

[berkeman]

Thread closed temporarily for Moderation...

 

[berkeman]

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.