Sine wave - phasor

Author:
E _Cami
Topic:
Sine
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:
    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"
The x-coordinate is represented by point Q. You can:
    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"
What is the path of y? What is the path of x?