First and second derivative assistance please?

  • Thread starter Khamul
  • Start date
  • #1
24
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Homework Statement


r = 2/(2 - cos ([tex]\pi[/tex]*t))


Homework Equations



N/A

The Attempt at a Solution


Hello everyone, first I would just like to say (which is obvious since i'm asking :tongue: ) That it's been a long long time since i've had to do derivatives, hence my total cluelessness with this. I've had to integrate frequently in my engineering courses, but this is a problem that arose in my dynamics class...and embarrassingly enough, i'm not even sure where to begin. :confused:

Could someone help me out? I'm going to be unable to proceed with my problem (it involves radius of curvatures) until I get the first and second derivatives of this bad boy. Thanks in advance!
 
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Answers and Replies

  • #2
berkeman
Mentor
59,466
9,577

Homework Statement


r = 2/(2 - cos ([tex]\pi[/tex]*t))


Homework Equations



N/A

The Attempt at a Solution


Hello everyone, first I would just like to say (which is obvious since i'm asking :tongue: ) That it's been a long long time since i've had to do derivatives, hence my total cluelessness with this. I've had to integrate frequently in my engineering courses, but this is a problem that arose in my dynamics class...and embarrassingly enough, i'm not even sure where to begin. :confused:

Could someone help me out? I'm going to be unable to proceed with my problem (it involves radius of curvatures) until I get the first and second derivatives of this bad boy. Thanks in advance!

Here's the wikipedia page that will help you out:

http://en.wikipedia.org/wiki/Quotient_rule

I just remember it as "The bottom multiplied by the derivative of the top, minus the top multiplied by the derivative of the bottom, all over the bottom squared."
 
  • #3
24
0
Aha! THAT'S the bugger I forgot. I kept thinking of the product rule, and how utterly insane it made this. This helps a bunch, thank you :)
 

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