Display the source code in std/math/trigonometry.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

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

Example

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);

Authors

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

License

Boost License 1.0.