Drawing a blank on this one.

$cos(\dfrac{\pi*x}{8})=\dfrac{-x}{2}\sqrt{\dfrac{\pi}{8}$

I've got the numerical solution (easy) but I'm stuck on an analytical solution, if there is one. Any ideas?

## Monday, January 7, 2013

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Dumb question here: Is there any restriction on x? Last I knew, there is no analytical solution to cos(x) = x.

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