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# Hyperbolic Functions Help watch

1. Hi,
So the question is find the roots of the following equations in terms of u

x^2 - 2xcoshu+ 1.

I applied quadratic formula and I got (-2coshu +/- sqr 2coshu^2-4) /2

I am a bit stuck as to where to go from here. I factored out 2 (in the sqr part) to get (coshu^2-2) and now very stuck as to where to go from here as I can't find any identities which can help?

Thanks,
2. (Original post by ChemBoy1)
Hi,
So the question is find the roots of the following equations in terms of u

x^2 - 2xcoshu+ 1.

I applied quadratic formula and I got (-2coshu +/- sqr 2coshu^2-4) /2

I am a bit stuck as to where to go from here. I factored out 2 (in the sqr part) to get (coshu^2-2) and now very stuck as to where to go from here as I can't find any identities which can help?

Thanks,
Assuming that expression is =0, you should've gotten

There indeed is an identity you can use for the root.
3. Wow I see where I went wrong now, all makes sense. Thanks again!

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