TIB: Bad Graph...


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TIB: Bad Graph...




Hi all !


I have: f(x) = sin^2 (x) - 2.sin x - 2

How to enter it in my TI-85 ?

When f(x) = 0, x must be around -.82 (i'm sure, I've calculated it)
and the TI finds -.78... What's wrong ?

Thanks

Brice-Oliver 


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