Posted by Steve on Wednesday, December 16, 2009 at 9:46pm.
Rewrite 8 cos2 x as an equivalent expression that does not contain powers of trigonometric functions greater than 1

trig  bobpursley, Wednesday, December 16, 2009 at 9:49pm
cos^2 x= cosX * CosX
Surely you are looking for something more complex than that.