Isolating harmonics with band-pass filter

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Electric waveforms like square, sawtooth, and triangle waves can be decomposed into sine waves with added harmonics. A band-pass filter (BPF) can effectively isolate specific harmonics from these waveforms. The effectiveness of this isolation depends on the quality and sharpness of the BPF used. Additionally, the degree of suppression of unwanted harmonics is relative to the desired outcome. Properly applied, band-pass filters can achieve precise harmonic isolation.
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If electric waveforms such as square waves, sawtooth waves, and triangle waves are really no more than sine waves with added harmonics, one could run such a wave through a bandpass filter (or several) and isolate one of the harmonics as a sine wave?
 
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Yes! You need good and sharp BPF though. Also, it's all relative, it's all about how low you want to suppress the unwanted harmonics.
 

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