The equation cos(ax)=0 has a closed form solution in terms of x(adsbygoogle = window.adsbygoogle || []).push({});

so does cos(ax)+cos(bx)=0

but I am sure that cos(ax)+cos(bx)+cos(cx)=0 does not

I first encountered this problem back in late 2003 and began working on it again

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# Very difficult math problem

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