cosht

Cos by tau approximation.


Syntax
   [F, e, n] = cosht(A)

Description
   F = cost(A) approximates cos(A) by tau method. 

Required
   x = itau object.

Input
   A = any matrix.

Output
   F = polynomial approximation of cos(M) in [a, b] evaluated (with 
       orthovalM) in argument M = matrixM(x) = M(x). (double matrix).

See also
  schursolver and orthovalM.