I need to plot the graph of a relatively complicated implicitly defined function, say f(x,y) = 0, defined on the unit square [01,] x [0,1]. I might be able to write a macro that would generate the y value(s) numerically for a sequence of

*x*values and then draw the graph, but it occurs to me that almost certainly someone has already faced the same problem and has written such a macro, so I'm asking. A simple example of the sort of function I'm dealing with is, for example, f(x,y) = x^{2}- 2y - sin(xy) = 0.