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Square
The wave with the maximum RMS value, in comparision with the peak value, is the square wave.
A: square wave can be positive and or negative. A digital signal is a square wave but it can be of invariable duty cycles
Filter the square wave with a low-pass filter sharp enough to remove all frequencies
above the frequency of the square wave.
If you use a square wave as input to an integrator circuit, the output will be a triangle wave.