Hyperbolic Functions

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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