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#include <math.h>
double
acos(double x)
float
acosf(float x)
DESCRIPTION
The acos() and acosf() functions compute the principal value of the arc
cosine of x in the range [0, pi].
RETURN VALUES
Exceptional cases are handled by matherr(3).
SEE ALSO
sin(3), cos(3), tan(3), asin(3), atan(3), atan2(3), sinh(3),
cosh(3), tanh(3), math(3), matherr(3)
BSD Experimental May 2, 1991 1
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