cos - Skys docwiki

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cos

real cos(real x)

Returns the cosinus of x (radians).

If x is ±INFINITY, the function returns -NAN.

Example:

//don't forget to import std.stdio and std.math :-)

writefln("cos(0)    is %f",cos(0));
writefln("cos(PI/2) is %f",cos(PI/2));
writefln("cos(PI/4) is %f",cos(PI/4));
writefln("cos(INF)  is %f",cos(float.infinity));
writefln("cos(-INF) is %f",cos(-float.infinity));

Output:

cos(0)    is 1.000000
cos(PI/2) is 0.000000
cos(PI/4) is 0.707107
cos(INF)  is -nan
cos(-INF) is -nan