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Function `std.math.trigonometry.cos`

Returns cosine of x. x is in radians.


						
				real cos
				(
				

				  real x
				

				) pure nothrow @nogc @safe;
				

				

				double cos
				(
				

				  double x
				

				) pure nothrow @nogc @safe;
				

				

				float cos
				(
				

				  float x
				

				) pure nothrow @nogc @safe;

Special Values
x	cos(x)	invalid?
NAN	NAN	yes
±∞	NAN	yes

Bugs

Results are undefined if |x| >= 2⁶⁴.

Example

import std.math.operations : isClose;

writeln(cos(0.0)); // 1.0
assert(cos(1.0).isClose(0.5403023059));
assert(cos(3.0).isClose(-0.9899924966));

Authors

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

License

Boost License 1.0.