ACOS _ _ _ _ _ _ _ _ _ _ _ _ operator
The acos operator returns the arccosine of its argument.
<expression> may be any scalar REDUCE expression, not an array, matrix or vector expression. <simple\_expression> must be a single identifier or begin with a prefix operator name.
acos(ab); ACOS(AB) acos 15; ACOS(15) df(acos(x*y),x); 2 2 SQRT( - X *Y + 1)*Y -------------------- 2 2 X *Y - 1 on rounded; res := acos(sqrt(2)/2); RES := 0.785398163397 res-pi/4; 0
An explicit numeric value is not given unless the switch rounded is on and the argument has an absolute numeric value less than or equal to 1.