{
  "name": "acos",
  "type": "function",
  "groups": ["Math"],
  "description": "Returns the inverse cosine of a value in radians.",
  "arguments": [{
    "arg": "value",
    "description": "cosine of an angle in radians"
  }],
  "examples": [{
    "expression": "acos(0.5)",
    "returns": "1.0471975511966"
  }],
  "tags": ["angle", "cosine", "inverse", "radians"]
}