ACOS(3) Library Functions Manual ACOS(3) NAME acos, acosf, acosl -- arc cosine functions LIBRARY Math Library (libm, -lm) SYNOPSIS #include <math.h> double acos(double x); float acosf(float x); long double acosl(long double x); DESCRIPTION The acos(), acosf(), and acosl() functions compute the principal value of the arc cosine of x. RETURN VALUES These functions return the arc cosine in the range [0, pi] radians. If: |x| > 1, acos(x) raises an invalid exception and returns an NaN. SEE ALSO asin(3), atan(3), atan2(3), cos(3), cosh(3), fenv(3), math(3), sin(3), sinh(3), tan(3), tanh(3) STANDARDS The acos(), acosf(), and acosl() functions conform to ISO/IEC 9899:1999 ("ISO C99"). FreeBSD 15.1 July 31, 2008 ACOS(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS
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