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In my app I need to solve a set of 3 equations. But I really struggle, because these 3 equations contain 4 unknown. So the result would be some function of a fith variable. Very simple Example: u = cos(s) v = sin(s) 1 = t I really don‘t know a method how to solve it. I think it can‘t be solved numerically ,because the result is a function. I thought about to convert the this functions into Fourier series and solve than the set of equations. But I am not sure if this works either. Does anyone know any framework for this. I have looked on the the internet but found nothing.