Question: sine wave intersection

Hello,

           I really need help creating a formula to get  the intersection  of 2 different sine waves with one single formula. I need to be able to vary the frequencies es and get data with one formula avoiding breaking down the process in different steps.

Does anybody know how to do this? I've tried for hours playing around with the basic sine wave forulae, attempting to make them interact but to no avail...

This is for a big project and your input will bevery much appreciatd (more than you realize). Thanks in advance for your help!

Tony

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