View source code
Display the source code in std/complex.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
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.complex.cos

Trigonometric functions on complex numbers.

Complex!T cos(T) (
  Complex!T z
) pure nothrow @nogc @safe;


z A complex number.


The sine, cosine and tangent of z, respectively.


static import core.math;
writeln(sin(complex(0.0))); // 0.0
writeln(sin(complex(2.0, 0))); // core.math.sin(2.0)


static import core.math;
static import std.math;
writeln(cos(complex(0.0))); // 1.0
writeln(cos(complex(1.3, 0.0))); // core.math.cos(1.3)
writeln(cos(complex(0.0, 5.2))); // std.math.cosh(5.2)


static import std.math;

int ceqrel(T)(const Complex!T x, const Complex!T y) @safe pure nothrow @nogc
    import std.math.operations : feqrel;
    const r = feqrel(,;
    const i = feqrel(,;
    return r < i ? r : i;
assert(ceqrel(tan(complex(1.0, 0.0)), complex(std.math.tan(1.0), 0.0)) >= double.mant_dig - 2);
assert(ceqrel(tan(complex(0.0, 1.0)), complex(0.0, std.math.tanh(1.0))) >= double.mant_dig - 2);


Lars Tandle Kyllingstad, Don Clugston


Boost License 1.0