Sine wave - phasor
Notice how the x- and y- coordinates of the endpoint B of the phasor change as the phasor rotates.
Click the Play button to start rotating the phasor.
The y-coordinate is represented by point P. You can:
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Make it visible by clicking on the button preceding P on the left menu
Trace the changes by right clicking on P on the left menu, and choosing "Trace On"
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Make it visible by clicking on the button preceding Q on the left menu
Trace the changes by right clicking on Q on the left menu, and choosing "Trace On"