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- Nov 22nd 2009, 07:35 AM #1

- Joined
- Nov 2009
- Posts
- 87

## How do I do this?

The question tells me to use the properties of logarithms and trigonometric idntities to verify the identity. *In this case, the brackets represent absolute value.

ln [sec theta] = - ln [cos theta]

Now I am not sure how to make one side equal the other.

I am thinking:

ln [1/cos theta]

but I am not sure?

Any help is appreciated.

- Nov 22nd 2009, 07:43 AM #2