trig:

Syntax:	acos ( A )

	asin ( A )

	atan ( A )

	atan2 ( X , Y )

	cos ( A )

	cosh ( A )

	sin ( A )

	sinh ( A )

	tan ( A )

	tanh ( A )

Description:


	The trigonometric functions are scalars functions.  The return
	value is the result of the trigonometric operation performed
	on the input, element-by-element.

	{\bf atan2} returns the arctangent of $A/B$. 

	All the trigonometric functions use the C language math
	library functions, so details about the ranges and error
	conditions can be found by examining the appropriate man pages
	on your system.

	Atan2 does not operate on complex arguments.
