# Solving ∫(secx^2)(e^cotx)dx

1. Jul 28, 2014

### dasboot58

<< Moderator's Note -- Original post (OP) restored after being deleted by the poster >>

∫(secx^2)(e^cotx)dx

Thank you so much!

∫(secx^2)(e^cotx)dx

And

∫9x^3/Square root of (1+x^2) dx NEED TO USE SUBSTITUTION X=Tanx

Thank you so much!

Last edited by a moderator: Jul 28, 2014
2. Jul 28, 2014

### Shinaolord

Urgent!!!

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

3. Jul 28, 2014

### 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.

4. Jul 28, 2014

### 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.

5. Jul 28, 2014

### 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.

6. Jul 28, 2014

### Shinaolord

Post what you think is your best attempt.

7. Jul 28, 2014

### dasboot58

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

Last edited: Jul 28, 2014
8. Jul 28, 2014

### Student100

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?

9. Jul 28, 2014

### dasboot58

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. Jul 28, 2014

### Student100

Are you trying to do it by parts? What is your u and v?

11. Jul 28, 2014

### dasboot58

I don't think you can do it by parts. I'm guessing U would be secx^2 and ∫dv=∫e^cotx

12. Jul 28, 2014

### Staff: Mentor

13. Jul 28, 2014