# Math Help - square sine wave

1. ## square sine wave

Does anyone know the formula for a square sine wave?

Thanks

2. Originally Posted by rainer
Does anyone know the formula for a square sine wave?

Thanks
I'm not sure what you mean by "squared sine wave". The identity $sin^2\theta +cos^2\theta=1$ gives $sin^2\theta =1-cos^2\theta$. Is this what you're looking for?

3. No, I mean square like in the attached picture.

4. Originally Posted by rainer
No, I mean square like in the attached picture.
There are many ways to define a square wave. Read

Fourier Series--Square Wave -- from Wolfram MathWorld