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  12 .TH tanh 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  13 .SH NAME
  14 tanh, tanhf, tanhl \- hyperbolic tangent function
  15 .SH SYNOPSIS
  16 .LP
  17 .nf
  18 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  19 #include <math.h>
  20 
  21 \fBdouble\fR \fBtanh\fR(\fBdouble\fR \fIx\fR);
  22 .fi
  23 
  24 .LP
  25 .nf
  26 \fBfloat\fR \fBtanhf\fR(\fBfloat\fR \fIx\fR);
  27 .fi
  28 
  29 .LP
  30 .nf
  31 \fBlong double\fR \fBtanhl\fR(\fBlong double\fR \fIx\fR);
  32 .fi
  33 
  34 .SH DESCRIPTION
  35 .sp
  36 .LP
  37 These functions compute the hyperbolic tangent of their argument \fIx\fR.
  38 .SH RETURN VALUES
  39 .sp
  40 .LP
  41 Upon successful completion, these functions return the hyperbolic tangent of
  42 \fIx\fR.
  43 .sp
  44 .LP
  45 If \fIx\fR is NaN, a NaN is returned.
  46 .sp
  47 .LP
  48 If \fIx\fR is \(+-0, \fIx\fR is returned.
  49 .sp
  50 .LP
  51 If \fIx\fR is \(+-Inf, \(+-1 is returned.
  52 .SH ERRORS
  53 .sp
  54 .LP
  55 No errors are defined.
  56 .SH ATTRIBUTES
  57 .sp
  58 .LP
  59 See \fBattributes\fR(5) for descriptions of the following attributes:
  60 .sp
  61 
  62 .sp
  63 .TS
  64 tab() box;
  65 cw(2.75i) |cw(2.75i) 
  66 lw(2.75i) |lw(2.75i) 
  67 .
  68 ATTRIBUTE TYPEATTRIBUTE VALUE
  69 _
  70 Interface StabilityStandard
  71 _
  72 MT-LevelMT-Safe
  73 .TE
  74 
  75 .SH SEE ALSO
  76 .sp
  77 .LP
  78 \fBatanh\fR(3M), \fBisnan\fR(3M), \fBmath.h\fR(3HEAD), \fBtan\fR(3M),
  79 \fBattributes\fR(5), \fBstandards\fR(5)