# Homework Help: Analysis problem using the Lagrange Remainder Theorem

1. Jun 27, 2011

### shan1732

1. The problem statement, all variables and given/known data
Prove that for every pair of numbers x and h, $\left|sin\left(x+h\right)-\left(sinx+hcosx\right)\right|\leq\frac{h^{2}}{2}$

3. The attempt at a solution
Let f(x)= $\left|sin\left(x+h\right)-\left(sinx-hcosx\right)\right|$?
and then to center the taylor polynomial around 0 let h=0? I'm not sure how to get the taylor polynomial for this so that it can be compared to $\frac{h^{2}}{2}$

2. Jun 27, 2011

### micromass

Hi shan1732!

Try to calculate the Taylor polynomial of the sine around x.