Solve for the offset of two sin waves

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SUMMARY

The discussion focuses on solving the equation sin(ax + by + c) = sin(ix + jy + d) for the constants c and d, given only the difference between them. Participants emphasize that directly applying the arcsin function does not yield valid solutions due to the nature of sine functions. The consensus is that it is impossible to determine both c and d independently; instead, one can only express the relationship between them, such as c = d + k, where k represents the known difference.

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NotASmurf
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Hey all, how does one solve sin(ax + by + c) = sin(ix + jy + d) for d and c if you only know the difference between d and c? Any help appreciated, simply arcsin'ing both sides does not work as you get impossible answers in the exact example I had.
 
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You cannot solve it for both c and d, because the difference is the only thing that influences the equality. It's like trying to solve c=d+1 for both c and d - you cannot, you can only solve for the difference (here: 1).
 

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