ANSYS FLUENT 12.0 UDF Manual - A.13.1 Trigonometric Functions

The trigonometric functions shown below are computed (with one exception) for the variable x. Both the function and the argument are double-precision real variables. The function acos(x) is the arccosine of the argument x, cos $^{-1}(x)$ . The function atan2(x,y) is the arctangent of x/y, tan $^{-1}(x/y)$ . The function cosh(x) is the hyperbolic cosine function, etc.

`double acos (double x);`	returns the arccosine of
`double asin (double x);`	returns the arcsine of
`double atan (double x);`	returns the arctangent of
`double atan2 (double x, double y);`	returns the arctangent of
`double cos (double x);`	returns the cosine of
`double sin (double x);`	returns the sine of
`double tan (double x);`	returns the tangent of x
`double cosh (double x);`	returns the hyperbolic cosine of
`double sinh (double x);`	returns the hyperbolic sine of
`double tanh (double x);`	returns the hyperbolic tangent of