## cost

Cosine by tau approximation for itau object.

Cosine by tau approximation for itau object.

[F, e, n] = cost(x)

F = cost(x) is a function to approximate by tau method cos(x), x in [a, b].

x = independent tau variable (itau object).

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

sint, sinht, cosht, expt and logt.