A cosine is shifted by 90 degrees, starting at -1 for 0 degrees,
building to +1 at 180 degrees, and dropping again to -1 at 360 degrees.
The cosine of zero is +1 and the cosine of 180 degrees is -1.
Ah, I shoud've checked my math before I hit "send." Yes, you are correct.
Lyle
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