## cosi

Cosine by orthogonal interpolation for itau object.

Cosine by orthogonal interpolation for itau object.

F = cosi(x)

F = cosi(A) is a function to approximate by orthogonal interpolation cos(A), where A is a matrix or an itau object.

A = independent tau variable (itau object) or any matrix.

F = polynomial approximation of cos(A) in [a, b] evaluated with orthovalM (itau object: F.mat contains the matrix).

sini, cosi, sinhi, coshi, expi, logi and sqrti.