Sine wave with increasing peaks and increasing troughs

Hi,

No doubt, yes, assuming that it's mathematically possible to have such a sine curve, which I'm sure it is. Do you have the data ready to plot?

Regards

I would class your question as more of a trig/math question than Excel.

Basic intro to amplitude in sin/cos functions http://www.intmath.com/trigonometric...speed=noscript
This tutorial focuses on a being a constant. To get these curves to have a continuously increasing (or decreasing) amplitude, we simply need to subsitute a suitable function of x in for a. The simplest expression might be y=x*sin(x), though you could conceivably use any number of functions for a.