The OpenD Programming Language

asin

Calculates the arc sine of x, returning a value ranging from -π/2 to π/2.

Special Values
x	asin(x)	invalid?
±0.0	±0.0	no
>1.0	NaN	yes
<-1.0	NaN	yes

real asin(real x)
@safe pure nothrow @nogc
real
asin
(
real x
)
double asin(double x)
float asin(float x)

Examples

import std.math.operations : isClose;
import std.math.traits : isIdentical, isNaN;
import std.math.constants : PI;

assert(isIdentical(asin(0.0), 0.0));
assert(asin(0.5).isClose(PI / 6));
assert(asin(PI).isNaN);

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Source

See Implementation

std math trigonometry functions