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When using Lissajous figures to determine phase differences, an indication of zero or 180 degrees is represented on the screen of an oscilloscope by:
a diagonal straight line
If two sinusoidal signals of the same frequency are in phase (0°) or 180° out of phase, the Lissajous pattern is a straight diagonal line. The slope indicates the phase (e.g., positive slope for 0°, negative for 180°).
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