# The derivative of (secx)^2?

• May 2nd 2009, 04:21 PM
rioneye
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?
• May 2nd 2009, 04:26 PM
Pinkk
Chain rule:

$2sec(x)\cdot \frac{d}{dx}sec(x)$
$2sec(x)\cdot sec(x)tan(x)$
$2sec^{2}(x)tan(x)$
• May 2nd 2009, 04:29 PM
rioneye
Quote:

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