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arccos(*x*) = cos^{-1}(*x*)

For example, If the cosine of 60° is 0.5:

cos(60°) = 0.5

Then the arccos of 0.5 is 60°:

arccos(0.5) = cos^{-1}(0.5) = 60°

x | arccos(x) | |
---|---|---|

degrees | radians | |

-1 | 180° | π |

-0.8660254 | 150° | 5π/6 |

-0.7071068 | 135° | 3π/4 |

-0.5 | 120° | 2π/3 |

0 | 90° | π/2 |

0.5 | 60° | π/3 |

0.7071068 | 45° | π/4 |

0.8660254 | 30° | π/6 |

1 | 0° | 0 |

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