Hva er det[46614]\det\begin{bmatrix}4&6\\6&14\end{bmatrix}det[46614] og inversen?
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det=4⋅14−6⋅6=56−36=20\det=4\cdot14-6\cdot6=56-36=20det=4⋅14−6⋅6=56−36=20. $(ATA)−1=120[14−6−64].\displaystyle (A^TA)^{-1}=\frac{1}{20}\begin{bmatrix}14&-6\\-6&4\end{bmatrix}.(ATA)−1=201[14−6−64].$
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