cos

Returns cosine of x. x is in radians.

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

real cos(real x)
double cos(double x)
pragma(inline, true) @safe pure nothrow @nogc
double
cos
(
double x
)
float cos(float x)

Bugs

Results are undefined if |x| >= 2⁶⁴.

Examples

import std.math.operations : isClose;

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

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Source

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std math trigonometry functions