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Function std.math.trigonometry.asin

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

real asin (
  real x
) pure nothrow @nogc @safe;

double asin (
  double x
) pure nothrow @nogc @safe;

float asin (
  float x
) pure nothrow @nogc @safe;

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


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));


Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger


Boost License 1.0.