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15.5.2 acos


Returns the arc cosine of numerical x, in radians. This function accepts complex arguments.

For ordinary (real) arguments, the arc cosine is only defined for arguments between -1 and +1 (inclusive). Multiply by #rad to get degrees.

The arc cosine function is defined for any complex argument.

Reverse: cos

See also: asin, atan, #rad, Trigonometry, Complex Functions