# 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

- SIN()
- TAN()
- COT()
- ASIN()
- ACOS()
- ATAN()
- ATN2()
- SINH()
- COSH()
- TANH()
- RTOD()
- DTOR()
- PI()