# Math Help - [SOLVED] Trigonometric Identities

1. ## [SOLVED] Trigonometric Identities

given cos2y = 2 - sec^2(y)/sec^2(y)

verify that each equation is an identity

my mind is very boggling right now so please can anyone help with the steps?

$cos(2\theta) = 2\cos^2\theta - 1$

3. i am sorry but i'm still stuck because i dont know what to do from there on, i've tried different identities but i don't think its leading to the right one.

4. $\frac{2 - \sec^2{y}}{\sec^2{y}} =$

$\frac{2}{\sec^2{y}} - \frac{\sec^2{y}}{\sec^2{y}} =$

$2\cos^2{y} - 1$

5. oohh..haha i guess i was thinking too hard and missed the simple steps.. thanks you very much