Express the following in the form [tex]z=Re[Ae^{i(\omega t+\alpha)}][/tex](adsbygoogle = window.adsbygoogle || []).push({});

[tex]z=cos(\omega t - \frac{\pi}{3}) - cos (\omega t)[/tex]

and

[tex]z=sin(\omega t) - 2cos(\omega t - \frac{\pi}{4}) + cos(\omega t)[/tex]

I got a few of the problems correct by using trig. identities but it was pretty tough and two I can't get. Our teacher said you can use a tric to solve them easier but didn't have time to finish, I just know it has something to do with the polar form of [tex]e^{i \theta}[/tex] I really have no clue on how to do these without using the really long method of trig. identities. Any help would be great. Thanks

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

Dismiss Notice

Join Physics Forums Today!

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

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

# Homework Help: Complex exponential help please

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