# Math Help - The derivative of (secx)^2?

1. ## The derivative of (secx)^2?

I know this is a lot simpler than I think it is, but I just had a brain lapse . Do any of you guys know what the he derivative of (secx)^2 is?

2. Chain rule:

$2sec(x)\cdot \frac{d}{dx}sec(x)$
$2sec(x)\cdot sec(x)tan(x)$
$2sec^{2}(x)tan(x)$

3. Originally Posted by Pinkk
Chain rule:

$2sec(x)\cdot \frac{d}{dx}sec(x)$
$2sec(x)\cdot sec(x)tan(x)$
$2sec^{2}(x)tan(x)$
Haha, I knew it would be simple. Thanks man