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Chebychev T Function
Math Miscellaneous Class

Public Function ChebychevT( _
      ByVal vN As Variant _
    , ByVal vX As Variant _
    ) As Variant

"Evaluate Chebychev T Polynomial"

Examples: 
    ChebychevT(1, 1) = 1
    ChebychevT(1, 2) = 2
    ChebychevT(1, 3) = 3
    ChebychevT(1, 4) = 4
    ChebychevT(2, 1) = 1
    ChebychevT(2, 2) = 7
    ChebychevT(2, 3) = 17
    ChebychevT(2, 4) = 31
    ChebychevT(3, 1) = 1
    ChebychevT(3, 2) = 26
    ChebychevT(3, 3) = 99
    ChebychevT(3, 4) = 244
See also: 
    Factorial Function
vN: The number of iterations. Function returns Null if vN is Null or cannot be fixed up to a number.

vX: The multiplier. Function returns Null if vX is Null or cannot be fixed up to a number.

Note: Function will return Null instead of generating an error if any of its calculations cause Overflow or other types of errors.
Definition: 

    If N = 0: 1
    If N = 1: X
    If N > 1: 2 * X * ChebychevT(N - 1, X) - ChebychevT(N - 2, X)

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