- #1

ehrenfest

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**[SOLVED] TI-89 integral**

## Homework Statement

My TI-89 says that

[tex]\int \frac{1}{\cos x} dx = \ln \left(\frac{-\cos(x)}{\sin(x)-1}\right)[/tex]

which is just wrong isn't it??!

See http://en.wikipedia.org/wiki/Lists_of_integrals

## Homework Equations

## The Attempt at a Solution

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