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NetBSD 6.1.5 - man page for tanh (netbsd section 3)

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TANH(3) 			   BSD Library Functions Manual 			  TANH(3)

NAME
     tanh, tanhf -- hyperbolic tangent function

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     tanh(double x);

     float
     tanhf(float x);

DESCRIPTION
     The tanh() and tanhf() functions compute the hyperbolic tangent of x.  For a discussion of
     error due to roundoff, see math(3).

RETURN VALUES
     Upon successful completion, these functions return the hyperbolic tangent value.  The fol-
     lowing may also occur:

	   1.	If x is +- 0, x is returned.

	   2.	If x is NaN, a NaN is returned.

	   3.	If x is positive infinity, a value 1 is returned; if x is negative infinity, -1
		is returned.

	   4.	If x is subnormal, a range error can occur and x is returned.

SEE ALSO
     acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3)

STANDARDS
     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD					September 18, 2011				      BSD
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