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1. The problem statement, all variables and given/known data

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

2. Relevant equations

3. The attempt at a solution

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# Calculators TI-89 integral

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