Click this button to go to the index for this section.

sinh(3)
NAME
  sinh, cosh, tanh, sinhcosh - Hyperbolic functions

LIBRARY
  Math Library (libm.a)

SYNOPSIS
  #include <math.h>

  double sinh  (double x);
  float	 sinhf (float  x);
  double cosh  (double x);
  float	 coshf (float  x);
  double tanh  (double x);
  float	 tanhf (float  x);
  double sinhcosh  (double x);
  float	 sinhcoshf (float  x);

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  cosh():  XPG4

  sinh():  XPG4

  tanh():  XPG4

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

DESCRIPTION
  The sinh() and sinhf() functions compute the hyperbolic sine of x.  Both
  sinh(x) and sinhf(x) are defined as (exp(x) - exp(-x))/2.

  The cosh()  and coshf() functions compute the hyperbolic cosine of x.	 Both
  cosh(x) and coshf(x) are defined as (e**x + e**(-x))/2.

  The tanh() and tanhf() functions compute the hyperbolic tangent of x.	 Both
  tanh(x) and tanhf(x) are defined as (e**x - e**(-x))/(e**x + e**(-x)).

  The sinhcosh()  and sinhcoshf() functions compute both the hyperbolic sine
  and hyperbolic cosine of x.  Both sinhcosh(x) and sinhcoshf(x) are defined
  as sinh x + icosh x.

  The following table describes function behavior in response to exceptional
  arguments:

  __________________________________________________________________
  Function		    Exceptional Argument    Routine Behavior
  __________________________________________________________________
  sinh(), sinhf()	    |x|>ln(2 * max_float)   Overflow

  cosh(), coshf()	    |x|>ln(2 * max_float)   Overflow

  sinhcosh(), sinhcoshf()   |x|>ln(2 * max_float)   Overflow
  __________________________________________________________________

  The following table lists boundary values used by these functions:
  ____________________________________________________________________
  Value Name	      Data Type	  Hexadecimal Value   Decimal Value
  ____________________________________________________________________
  ln(2 * max_float)   S_FLOAT	  42B2D4FC	      89.41599

		      T_FLOAT	  408633CE8FB9F87E    710.475860073943
  ____________________________________________________________________