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geometric interpretation of trigonometric functions

I found this gem on twitter from @LucasVB.

Here's all the trigonometric functions in a way things actually make sense all around the circle. All the main identities are obvious in this geometric interpretation.

trig circle

The gif got a little ugly and messed up after I downloaded it as mp4 and tried to convert it back to a gif using FFmpeg and ImageMagick.

But damn this is so nice and easy to understand and well worth memorizing.