Linux Programmer’s Manual
asinh, asinhf, asinhl − inverse hyperbolic sine function
double asinh(double x);
float asinhf(float x);
long double asinhl(long double x);
Link with −lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
asinh(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or
asinhf(), asinhl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE; or cc -std=c99
The asinh() function calculates the inverse hyperbolic sine of x; that is the value whose hyperbolic sine is x.
On success, these functions return the inverse hyperbolic sine of x.
If x is a NaN, a NaN is returned.
If x is +0 (−0), +0 (−0) is returned.
If x is positive infinity (negative infinity), positive infinity (negative infinity) is returned.
No errors occur.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
acosh(3), atanh(3), casinh(3), cosh(3), sinh(3), tanh(3)
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