In Exercises use a computer algebra system to find the linear approximation and the quadratic approximation of the function at x = a. Sketch

In Exercises use a computer algebra system to find the linear approximation

and the quadratic approximation

of the function ƒ at x = a. Sketch the graph of the function and
its linear and quadratic approximations.

ƒ(x)
= arctan x, a =0

P(x) = f(a) + f'(a)(x a)