討論串[考古] 96東華
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f(0+h,0)-f(0,0). fx exsists iff the lim ----------------- exsists. h->0 h. both limits for fx and fy are 0, exsists.. f is differentiable if fx and fy
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我是用Lagrange. L(x,y,z) = x^2 + 2y^2 - 2x + 3 +λ(x^2 + y^2 - 10). Lx = 0. Ly = 0 => (x,y) = (√10,0) (-√10,0) (-1,3) (-1,-3). Lλ = 0. because the constra
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