Harmonics question

[Sean Costello]

At 04:34 PM 5/19/98 -0600, you wrote:
>
>Simple waveforms are expressible in terms of the strength of each of these
>harmonics.  A sine wave is simple - it's all fundamental.  A sawtooth wave
>has all of the harmonics, but the strength of each successive one decreases
>exponentially.  A triangle wave has only the even harmonics.  A square wave
>has only the odd harmonics. 

Actually, a triangle wave has only odd harmonics, just at lower amplitudes
than the square wave.

To have all even harmonics would be weird - would that mean that the
fundamental wouldn't be included? :)  The only waveform I know of with all
even harmonics would be a full-wave rectified sine.  Is there any simple
function that contains all even harmonics?  If so, what does the waveform
look like?

Sean Costello