Just started trig, please show step by step.

1> cos 19pi / 12 using Half-Angle Identites

2> cos 165* using Half-Angle Identites

any help would be greatly appreciated!

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- May 14th 2009, 09:01 PMDaniels4691Trig Identity Problem
Just started trig, please show step by step.

1> cos 19pi / 12 using Half-Angle Identites

2> cos 165* using Half-Angle Identites

any help would be greatly appreciated! - May 15th 2009, 08:12 AMskeeter