# Homework Help: Help Simplifying Equation

1. Apr 17, 2010

### BoT

1. ex*eh+e-x*e-h -ex -e-x/ 2h

2. This should simplify to (e^x-e^-x)/2. This is lim (h--->0) so in the end the h should become 0 (I think!)

3. I have absolutely no idea what to do!

2. Apr 17, 2010

### sylas

I presume your original equation is
$$\frac{e^x e^h + e^{-x} e^{-h} - e^x - e^{-x}}{2h}$$​

Look for some common factors.