# Cosine

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• January 18th 2009, 01:00 PM
live_laugh_luv27
Cosine
If cosθ = 0.6, then cos(θ + http://mathforum.org/dr.math/faq/pi3.gif) = ?

How would I start this problem?
Thanks for your help!
• January 18th 2009, 01:27 PM
Mush
Quote:

Originally Posted by live_laugh_luv27
If cosθ = 0.6, then cos(θ + http://mathforum.org/dr.math/faq/pi3.gif) = ?

How would I start this problem?
Thanks for your help!

$cos(\theta+\pi) = -cos(\theta)$