(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Two "waves", characterized by cosx and cos^2(x/2) interfere. Using phasors or complex numbers or trigonometry as necessary, aggregate "cosx + 2cos^2(x/2)" - i.e. rewrite as a single cosine.

2. Relevant equations

I was told that there is an error in the way this questions was written and that cos is supposed to be cis

cisθ = cosθ + isinθ

3. The attempt at a solution

I don't know what to do. Am I supposed to replace all of the cosines in the original problem with cis?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Phasors, complex numbers, trig. question

**Physics Forums | Science Articles, Homework Help, Discussion**