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I'm pretty sure that there is a mistake in the unit circle animation under "The sine and the cosine". It looks like the author mixed up sin and cos You can rig

I'm pretty sure that there is a mistake in the unit circle animation under "The sine and the cosine". It looks like the author mixed up sin and cos You can right click the image and "Open image in a new tab" for a freeze frame, then checking the values it seems they are switched.

wrycoder 2y ago
And once you swap the labels on the lower left, it appears that the sign of the sin is reversed.
nomemory 2y ago
Thank you for noticing. I will look into the code.