GenerateRandomBivariatePolynomial - create a bivariate polynomial which is defined by coeffs of all possible combinations of powers of x and y, such that powers of x and y are less than t (threshold). accepts param secret = f(0,0) Example coeff. matrix: f00, f01.y, f02.y^2 f10.x, f11.x.y,
(secret big.Int, threshold int)
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