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!

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- January 18th 2009, 01:00 PMlive_laugh_luv27Cosine
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 PMMush