Multivariable CalculusMediumOptimization & Lagrange Multipliers ShareOptimization & Lagrange Multipliers · Medium problemHow many critical points does f(x,y)=x4+y4−4xy+1f(x,y) = x^4 + y^4 - 4xy + 1f(x,y)=x4+y4−4xy+1 have?Check Show answer Walk through it step by step Practice more like this Review this concept