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#include <math.h> double acos(double x);
This function returns the angle in the range [0..Pi]
radians
whose cosine is x. If the absolute value of x is greater
than 1, a domain error occurs, and errno
is set to EDOM
.
The arc cosine, in radians, of x. If the absolute value of
x is greater than 1, the function returns a NaN
.
ANSI, POSIX
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