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**infinitebrain****Member**- Registered: 2008-07-01
- Posts: 153

My textbook keeps saying it is

. Could someone work it step by step and show me how that answer is derived. I would appreciate it because I keep getting lost. Thanks![

The best thing about life is you don't know what to expect

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,164

Hi infinitebrain;

Your textbook is correct.

You can start with this page which shows how to get the derivative of arcsec

http://www.math.brown.edu/UTRA/trigderivs.html

Then you just use the chain rule.

From the above link:

The chain rule says:

Now just substitute u = 1 / t and clean up.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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