## Arccos calculator:

Use our online Arccos calculator and Inverse cosine calculator (**cos-1** calculator).

## Cos^{−1}(*x*), Arccos** **Definition:

Definition of **Arccos **provided by wikipedia:

arccos (trigonometry), the inverse trigonometric function of cosine.

In mathematics, the inverse trigonometric functions (occasionally called cyclometric functions[1]) are the inverse functions of the trigonometric functions (with suitably restricted domains). Specifically, they are the inverses of the sine, cosine, tangent, cotangent, secant, and cosecant functions, and are used to obtain an angle from any of the angle’s trigonometric ratios. Inverse trigonometric functions are widely used in engineering, navigation, physics, and geometry.

The arccosine of x is defined as the inverse trigonometric function of cosine when -1≤x≤1.

When :

cos

y=x.Then the arccosine of x is equal to the inverse cosine trigonometric function of x, which is equal to y:

arccos

x= cos^{-1}x=y.

## Arccos Table (cos-1) :

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

(rad) terms of pi | (°) in degrees | |

arccos -1 | π | 180° |

arccos -√3/2 | 5π/6 | 150° |

arccos -√2/2 | 3π/4 | 135° |

arccos -1/2 | 2π/3 | 120° |

arccos 0 | π/2 | 90° |

arccos 1/2 | π/3 | 60° |

arccos √2/2 | π/4 | 45° |

arccos √3/2 | π/6 | 30° |

arccos 1 | 0′ | 0° |