Zilog Z8F0130 - Manual (Page 456)

Appendix B. C Standard Library UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
Example
double y=0.5635;

double x;

x=acos(y)
asin
Computes the principal value of the arc sine of x . A domain error occurs for arguments not
in the range [-1,+1].
Synopsis
#include

double asin(double x);
Returns
The arc sine in the range [-pi/2,+pi/2].
Example
double y=.1234;

double x;

x = asin(y);
atan
Computes the principal value of the arc tangent of x.
Synopsis
#include

double atan(double x);
Returns
The arc tangent in the range (-pi/2, +pi/2).
Example
double y=.1234;

double x;

x=atan(y);