Is there an equation for sinusoid about a curve?

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The discussion focuses on creating a sine wave that follows a curved path rather than a straight line. The equation provided is r = a - b*cos(w*t), where 'a' represents the radius of the center circle, 'b' is the amplitude of the sine wave, 'w' denotes the frequency, and 't' is the angle ranging from 0 to 2π. This formulation allows for the sine wave to conform to a circular shape, effectively mimicking the edge of a cookie cutter. An example with parameters a = 5, b = 0.5, and w = 10 illustrates this concept visually.

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The typical sine wave y = sin(x) has its center line as y = 0. Is there any equation I can represent a sine wave that has a center line as a curve? Something like the edge of the cookie cutter:
http://www.pmeartsandcrafts.com/4010-16826-large/round--wavy-edge-cutters-xxxl.jpg
 
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You basically need a sine wave along a curved dimension. Here is one function that achieves this.

r = a - b*cos(w*t)
a is the radius of center circle.
b is the amplitude of sine wave.
w is the frequency of the wave. I chose integer value for w to make sure the sine wave ends where it started.
t is the angle, goes from 0 to 2pi.

Here is an http://shareimage.org/images/uh7fobqbcznu724zhu.png" with a = 5, b = 0.5, w = 10.
 
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