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acosh | Function (ROM Call 0x288*) |
math.h, timath.h |
float acosh (float x); |
Floating point hyperbolic area cosine.
asinh returns the hyperbolic area cosine of floating point argument x,
Hyperbolic area cosine is defined as log(x+sqrt(x*x-1)).
Note: acosh will return NAN if x is smaller than 1.