Posted by Carmen on Monday, June 2, 2008 at 9:18pm.
Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help
cos (7pi/12)

trig  Reiny, Monday, June 2, 2008 at 10:04pm
7pi/12 radians = 105º = (6045)º
Now use the same method I showed you several posts above this one.