...f_x = 0, f_y = 0 ==> (x, y) = (-1/3, 2/3) is a critical pont(臨界點) of f. f_xx(x, y) = 8, f_xy(x, y) = 1, f_yy...4 f_x = 0, f_y = 0 ==> (x, y) = ( - 1, - 2) is a critical pont of f. f_xx(x, y) = 2, f_xy(x, y) = 0, f_yy (x, y...
...part;y= -sin(x) ∂²f/∂y²=0 行列式=-(sinx)²=(cosx)² -1 故 critical point處行列式= -1<0,為 saddle points saddle points...
... equal (b) H_0 : σ^2 = 1 H_1 : σ^2 > 1 α = 0.05, critical value: Χ_6(0.05) = 12.6 Test - statistic = (n - 1)S^2/σ^2...
...0 and fy=0 has only one solution (a,b)=(0,0). To classify this only critical point of f we appy the so-called second derivative test. We ...
...: O型血型的人約總人口少於45%或p<0.45 α=0.05, critical value=-1.65,n=60 test-statistic =(21/60-0.45)/√[(0.45)(0.55)/60] =-1.5570 因為...
...famliy of y^2-x^2+x^3= 2C, C is any real number (b) critical point (node) x"=x-1.5x^3 then { x'=y { y'=x- 1.5x^2 = -1.5(x- 2...
