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 Quote by Chen Thanks for your tips. I was able to get the equation to the form: $$a^2 cos(ax) + b^2 cos(bx) = c$$ where a,b,c are different constants, but still irrational. Any ideas from here? :) Thanks!
I spent half-an-hour trying to solve it for x. But I couldn't. I am starting to think that there is no closed form solution to this equation. Anyone else share the same thought?