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Obligatoriske oppgaver for uke 3

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La funksjonen $f:X\\subseteq\\mathbb{R}^n\\rightarrow \\mathbb{R}$ være deriverbar i punktet $\\mathbf{a}$

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Velg hvilke påstander som er riktige

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La funksjonen $f:X\\subseteq\\mathbb{R}^2\\rightarrow\\mathbb{R}$ være deriverbar i $\\mathbf{a}$.

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La $f_x(\\mathbf{a})=f_y(\\mathbf{a})=0$ og $A=f_{xx}(\\mathbf{a})$, $B=f_{xy}(\\mathbf{a})$, $C=f_{yy}(\\mathbf{a})$.

\n

Velg matchende påstander

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La funksjonen $f:X\\subseteq\\mathbb{R}^3\\rightarrow\\mathbb{R}$ være deriverbar i $\\mathbf{a}$.

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La $f_x(\\mathbf{a})=f_y(\\mathbf{a})=f_z(\\mathbf{a})=0$.

\n

La $d_1=f_{xx}(\\mathbf{a})$, $d_2=\\left| \\begin{array}{ccc} f_{xx}(\\mathbf{a}) & f_{xy}(\\mathbf{a})  \\\\ f_{yx}(\\mathbf{a}) & f_{yy}(\\mathbf{a}) \\end{array} \\right|$,   $d_3=\\left| \\begin{array}{ccc}  f_{xx}(\\mathbf{a}) & f_{xy}(\\mathbf{a}) & f_{xx}(\\mathbf{a}) \\\\ f_{yx}(\\mathbf{a}) & f_{yy}(\\mathbf{a}) & f_{yz}(\\mathbf{a}) \\\\ f_{zx}(\\mathbf{a}) & f_{zy}(\\mathbf{a}) & f_{zz}(\\mathbf{a})\\end{array} \\right|$,  

\n

Velg matchende påstander

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La $f(x,y)=-x^2+xy-y^2-9y+6x$

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$f_x=$ [[0]] =0                          

\n

                                                                                             $\\Rightarrow$ $\\mathbf{a}=$ ([[2]],[[3]]) er et kritisk punkt

\n

$f_y=$ [[1]] =0

\n

\n

\n

$f_{xx}=$ [[4]]

\n

$f_{xy}=$ [[5]]

\n

$f_{yy}=$ [[6]]

\n

$A=f_{xx}(\\mathbf{a})$ = [[4]],  $B=f_{xy}(\\mathbf{a})$ = [[5]], $C=f_{yy}(\\mathbf{a})$ = [[6]],  $AC-B^2$= [[7]]

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Da $\\mathbf{a}$ er

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5 minutter igjen

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