I need to solve(adsbygoogle = window.adsbygoogle || []).push({});

sin(ax)sin(bx) - k cos(ax)cos(bx) = -1

where k > 1 is constant and so are a and b, and they are all irrational.

(It's part of a much larger question in optics...)

Any ideas, please?

Thanks

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# Complicated trigonometric equation

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