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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