They're all just simple combinations of dear old sine and cosine. ![]() I must admit I was a bit disappointed when I looked these up. Hacovercosine: hacovercosin(θ)=covercosin(θ)/2 Whether you want to torture students with them or drop them into conversation to make yourself sound erudite and/or insufferable, here are the definitions of all the "lost trig functions" I found in my exhaustive research of original historical texts Wikipedia told me about. Not pictured: vercosine, covercosine, and haver-anything. Excosecant and coversine are also in the image. The versine is in green next to the cosine, and the exsecant is in pink to the right of the versine. ![]() (It's well known that you can shake a stick at a maximum of 8 trig functions.) The familiar sine, cosine, and tangent are in red, blue, and, well, tan, respectively. A diagram with a unit circle and more trig functions than you can shake a stick at.
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