I was thinking about this, and wanted to know if it was true...(adsbygoogle = window.adsbygoogle || []).push({});

-cos(60) = cos(-60) = cos(300) = cos(60)

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

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: -cos(60) = cos(60)?

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