# Remainder Estimation Theorem

## Homework Statement

Find the maximum error in approximating cos(x) by its Taylor polynomial of order 2 on the
interval [

## Homework Equations

|R3(x)<=M/3! |x|^3

## The Attempt at a Solution

|R3(x)<=M/3! |x|^3 Plugging in the 3 is easy enough, but I don't understand where the M comes from. What is M here? I initally thought it might be the value of the 4th taylor polynomial, but that would make the remainder less than or = zero, right?