# Translations:Documentation/Calc Functions/ACOS/19/en

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Formula | Description | Returns |
---|---|---|

=ACOS(-1) | Inverse trigonometric cosine of -1 | 3.14159265358979 (PI radians or π) |

=ACOS(0.5) | Inverse trigonometric cosine of 0.5 | 1.0471975511966 (radians) |

=DEGREES(ACOS(0.5)) | Inverse trigonometric cosine of 0.5. Further, converting angle in radians to degrees. | 60° (degrees) |

=ACOS(-0.5)*180/PI() | Inverse trigonometric cosine of -0.5. Further, converting angle in radians to degrees by multiplying by 180/PI(). | 120° (degrees) |

=ACOS(2) | Inverse trigonometric cosine of 2 will return an invalid numeric value (#NUM!) error because 2 is out of its domain. | #NUM! |