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The functions in this section are related to the exponential functions; see section Exponentiation and Logarithms.
Function: double sinh (double x)
The sinh function returns the hyperbolic sine of x, defined
mathematically as exp (x) - exp (-x) / 2. The
function fails, and sets errno to ERANGE, if the value of
x is too large; that is, if overflow occurs.
Function: double cosh (double x)
The cosh function returns the hyperbolic cosine of x,
defined mathematically as exp (x) + exp (-x) / 2.
The function fails, and sets errno to ERANGE, if the value
of x is too large; that is, if overflow occurs.
Function: double tanh (double x)
This function returns the hyperbolic tangent of x, whose
mathematical definition is sinh (x) / cosh (x).
Function: double asinh (double x)
This function returns the inverse hyperbolic sine of x---the value whose hyperbolic sine is x.
Function: double acosh (double x)
This function returns the inverse hyperbolic cosine of x---the
value whose hyperbolic cosine is x. If x is less than
1, acosh returns HUGE_VAL.
Function: double atanh (double x)
This function returns the inverse hyperbolic tangent of x---the
value whose hyperbolic tangent is x. If the absolute value of
x is greater than or equal to 1, atanh returns
HUGE_VAL.
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