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You can just read the sine off of the picture! After a few weeks of struggling to remember which trig function was which for which angle in a triangle, learning about and then internalizing the unit circle was huge for me.

The one bonus trig function that confuses me a little bit is the vercosine.

The versine is a fairly obvious trig function to define and seems to have been used as far back as 400 CE in India.