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acos(expr0) ⇒ number
The acos() function returns the inverse cosine or arccosine of the argument as a number. The result is returned as a radian angle. The corresponding mathematical notations are:
acos(x) returns a numeric value between 0 and radians for x between -1 and 1. The value of x must be greater than or equal to -1 and less than or equal to 1.
Use the calculator at the top right of the window to find the inverse cosine of a number. Click the [2nd] key at the top left of the keypad, then click [acos].