Analyzing a Smooth Curve for -π < t < π

  • Thread starter Thread starter Masgr404
  • Start date Start date
  • Tags Tags
    Curve Smooth
Click For Summary

Homework Help Overview

The problem involves analyzing the smoothness of the curve defined by the parametric equations R(t) = (4sin^3(t), 4cos^3(t)) for the interval -π < t < π. Participants are exploring the characteristics of smooth functions in relation to this specific curve.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the smoothness of sine and cosine functions, questioning how this relates to the smoothness of the curve R(t). There is a focus on the implications of a denominator approaching zero and its effect on continuity and smoothness.

Discussion Status

The discussion is ongoing, with participants raising questions about the definition of a smooth curve and the specific conditions under which R(t) may not be smooth. Some guidance has been offered regarding the importance of continuity in determining smoothness.

Contextual Notes

There is a mention of a potential point where the denominator of a fraction related to the curve may approach zero, which could affect the smoothness. The participants are also considering the relevance of definitions and interpretations of smoothness in their analysis.

Masgr404
Messages
2
Reaction score
0

Homework Statement



Determine where r(t) is a smooth curve for -pi <t<pi
R(t)= (x(t),y(t))=(4sin^3(t), 4cos^3(t))

Homework Equations





The Attempt at a Solution



To be honest I have no idea where to start. I know what a smooth function is but my understanding is that the sin(t) and cos(t) functions over all of t are smooth. No corners.
Any starting help would be appreciated.
 
Physics news on Phys.org
Yes, but you are NOT asked if sine and cosine are smooth- you are asked if F is smooth. What happens if the denominator of a fraction goes to 0? What fraction is involved here?
 
The function is not continuous at that particular point that makes the denominator go to zero.
Perhaps we could rewrite in the complex plane?
 
No, it is not necessary to work with the complex plane. What is the definition of "smooth curve"?
 
As someone on mathstackexchange said, a smooth curve is a curve with no stubble, like this: :bugeye:
 

Attachments

  • smoothness.jpg
    smoothness.jpg
    15.2 KB · Views: 450
Last edited:

Similar threads

Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 7 ·
Replies
7
Views
1K