Forgotten Functions

Here are some functions you no longer see much.

coversine covers(x) = 1 − sin(x)
exsecant exsec(x) = sec(x) − 1
hacoversine, cohaversine, havercosine hacov(x) = covers(x) / 2
haversine (half versine) hav(x) = vers(x) / 2
versine (versed sine) vers(x) = 1 − cos(x)
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