Posted by alex on Tuesday, April 26, 2011 at 9:35pm.
use a sum or difference identity to find an exact value
cos pie/12

trig  bobpursley, Tuesday, April 26, 2011 at 9:42pm
see other post.
Posted by alex on Tuesday, April 26, 2011 at 9:35pm.
use a sum or difference identity to find an exact value
cos pie/12
see other post.