MQL4 Reference 
Math & Trig MathArcsin
| double MathArcsin( |
double x) |
The MathArcsin function returns the arcsine of x in the range -π/2 to π/2 radians.
If x is less than -1 or exceeds 1, the arcsine returns NaN (indeterminate value).
Parameters:
| x |
- |
Value the arcsine of which to be calculated |
Sample:
double x=0.32696, y;
y=MathArcsin(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
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