COS()

Cosine of the argument

Syntax

COS (nRadiant) -> nCosine

Arguments

<nRadiant> an angle size given in radiants

Returns

<nCosine> the cosine of <nRadiant>

Description

The function COS() calculates the cosine of an angle whose size is given in radiants (full angle equals 2*Pi - see DTOR() for angle size given in degress). A common geometric interpretation of the COS() function is the ankathede-hypotenuse-ratio of a right-angled triangle.
Examples
      ? cos (0.0) --> 1.0
      ? cos (1.0) --> 0.5403...
Tests
      cos (0.0) == 1.0
      cos (PI()/4) == sqrt(1/2)
      cos (PI()/2) == 0.0
      cos (PI()) == -1.0
Status

Ready

Compliance

COS() is compatible with CT3's COS().

Platforms

All

Files

Source is trig.c, library is libct.

See Also