# Deriving wave equation with single string and small amplitude wave.

**1.This equation in the link below refers to the small angle approximation regarding deriving the wave equation from newtons laws from small amplitude waves in a single string with fixed tension.**

**3. I’m a bit rusty on the maths and have no idea how these first order derivatives suddenly equal a second order derivative. could someone explain please? The notes I’m using are http://ift.tt/1kHf6mU**

http://ift.tt/1hdfU3X

## Leave a comment