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Cosine Function
Math Trig Complex Class

Public Function Cosine( _
    ByVal vX As Variant _
    ) As Variant

Cosine of a complex or real number.
Inverse of the ACos function.

Plot: 
    For X = -8 to 8 step .1:
       *****               ****               *****
      **   *              ** |**              *   **
      *     *            **  | **            *     *
     *      **           *   |  *           **      *
     *       *          *    |   *          *       *
    *        *          *    |   *          *        *
    *---------*--------*-----+----*--------*---------*
              **       *     |    *       **
               *      *      |     *      *
                *     *      |     *     *
                **   *       |      *   **
                 ****        |       ****

Examples: 
    Cosine(-0.5) = 0.877582561890373
    Cosine(0) = 1
    Cosine(0.5) = 0.877582561890373
    Cosine(1) = 0.54030230586814
    Cosine(1.5) = 7.07372016677029E-02
    Cosine(2) = -0.416146836547142
    Cosine(2.5) = -0.801143615546934
    Cosine(3) = -0.989992496600445
    Cosine(3.5) = -0.936456687290796
    Cosine("2.3|-4.5") = "-29.9918288739746|33.5589799796873"
See also: 
    Sine Function
    Tangent Function
    Cosecant Function
    ACos Function
    CosH Function
    Cos Function (Visual Basic)
vX: Number whose cosine is returned. Function returns Null if vX is Null or cannot be fixed up to a real or complex number (as defined by the ComplexStringToReals function). Complex numbers are represented within strings as "R|I" where R is the real part and I is the imaginary part.
Return: The result is expressed in radians.

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