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MQL4 Reference  Math & Trig  MathArccos

 
double MathArccos( double x)
The MathArccos function returns the arccosine of x within the range 0 to π (in radians). If x is less than -1 or exceeds 1, the MathArccos returns NaN (indeterminate value).
Parameters:
x   -   Value between -1 and 1 the arccosine of which to be calculated.
Sample:
  double x=0.32696, y;
  y=asin(x);
  Print("Arcsine of ",x," = ",y);
  y=acos(x);
  Print("Arccosine of ",x," = ",y);
  //Output: Arcsine   of 0.326960=0.333085
  //Output: Arccosine of 0.326960=1.237711