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Topic: Octave: to draw Taylor Series expansion around x = 0 for cos x

It is necessary to draw in the Octave Taylor Series expansion around x = 0 for cos x, [-2pi; 2pi]. A hitch all in that how to take  without symbolic a packet. In the Octave there is a numerical differentiation, but it something strange:  to understand as it to use. It is necessary for me only derivative function in which I will transfer value, and it returns me "tilt angle" in those . How it to make with diff, which vector on an input demands?