double acos (double x);
double acos (double x); float acosf (float x); long double acosl (long double x);
double acos (double x); float acos (float x); long double acos (long double x);
double acos (double x); float acos (float x); long double acos (long double x); double acos (T x); // additional overloads for integral types
<cmath>
) for the integral types: These overloads effectively cast x to a double
before calculations (defined for T being any integral type).<complex>
and <valarray>
(see complex acos and valarray acos).[-1,+1]
.180/PI
degrees.
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The arc cosine of 0.500000 is 60.000000 degrees. |