◄Syntax► ◄Details► ◄Example► ◄Contents► ◄Index► ◄Back► ────────────────────────────────────────────────────────────────────────────── ATN(numeric-expression) ■ numeric-expression Any numeric expression that properly expresses the ratio between the sides of a right triangle. Returns The arctangent of numeric-expression. See Also ◄TAN►