I need to simplify cos(arctan(x)). I did trig a few years ago and can't remember basic stuff like this.

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- Sep 4th 2009, 10:52 AMeniuqvwcomposite trig function simplification
I need to simplify cos(arctan(x)). I did trig a few years ago and can't remember basic stuff like this.

- Sep 4th 2009, 11:09 AMPlato