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tan
Computes a tangent value.
Syntax
#include <math.h>
double tan (double x)
Parameters
x A real number giving the angle measured in radians.
Return Values
n The tangent of the angle.
0 Indicates a complete loss of accuracy for large values of
x. A TLOSS error message is printed on the standard error
output. errno is set to ERANGE.
Description
The tan function returns the tangent of its argument x, measured in
radians. This function loses accuracy when its argument is sufficiently
large. For less extreme arguments causing partial loss of significance,
a PLOSS error is generated but no message is printed and errno is set to
ERANGE.
Error handling can be changed by a user-written matherr function.
See Also
sin(), cos(), ANSI C 4.5.2.7, POSIX.1 8.1