# Math Help - Little trig identity question.

1. ## Little trig identity question.

Since 1 - cos^2 x = sin^(2)x does that mean 1 - cos^(2)3x = sin^(2)3x?

2. Hello again
Originally Posted by cjh824
Since 1 - cos^2 x = sin^(2)x does that mean 1 - cos^(2)3x = sin^(2)3x?
Exactly !

x is just a name, you can put anything you want in it