ARCTAN

List of:	Law Symbols
Subjects:	Laws, SAT Save and Restore
Contents:	Laws

Action:				Makes a law that finds the arc tangent.
Derivation:				arctan_law : multiple_law : law : ACIS_OBJECT : -
Syntax:				ARCTAN (my_law)
Description:				The mathematical definition is:
				y = arctan x = tan-1x
				if and only if tan y = x
				where -pi/2 < y < pi/2
Example:				; law "ARCTAN(x)"
				; Define a law and take its derivative.
				(define f (law "arctan(x)"))
				;; f
				; => #[law "ARCTAN(X)"]
				(define df (law:derivative f))
				;; df
				; => #[law "(1+X^2)^-1"]

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HTM/DATA/LAW/LAW/08LAW/0014.HTM