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## Main Question or Discussion Point

The equation cos(ax)=0 has a closed form solution in terms of x

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

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