# Recent questions tagged diagonal

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Find the angle between a diagonal of a cube and one of its edges
Find the angle between a diagonal of a cube and one of its edgesFind the angle between a diagonal of a cube and one of its edges ...
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Let $A:=\left(\begin{array}{rrr}4 & 4 & 4 \\ -2 & -3 & -6 \\ 1 & 3 & 6\end{array}\right)$. Compute
Let $A:=\left(\begin{array}{rrr}4 & 4 & 4 \\ -2 & -3 & -6 \\ 1 & 3 & 6\end{array}\right)$. ComputeLet $A:=\left(\begin{array}{rrr}4 &amp; 4 &amp; 4 \\ -2 &amp; -3 &amp; -6 \\ 1 &amp; 3 &amp; 6\end{array}\right)$. Compute a) the characteristic po ...
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Find an example of $2 \times 2$ matrices $A$ and $B$ so that $A B=0$ but $B A \neq 0$.
Find an example of $2 \times 2$ matrices $A$ and $B$ so that $A B=0$ but $B A \neq 0$.Find an example of $2 \times 2$ matrices $A$ and $B$ so that $A B=0$ but $B A \neq 0$. ...
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Find all four $2 \times 2$ diagonal matrices $A$ that have the property $A^{2}=I$. Geometrically interpret each of these examples as linear maps.
Find all four $2 \times 2$ diagonal matrices $A$ that have the property $A^{2}=I$. Geometrically interpret each of these examples as linear maps.Find all four $2 \times 2$ diagonal matrices $A$ that have the property $A^{2}=I$. Geometrically interpret each of these examples as linear maps ...
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Let $A=\left(\begin{array}{rrr}1 & 1 & -1 \\ 1 & -1 & 2\end{array}\right)$
Let $A=\left(\begin{array}{rrr}1 & 1 & -1 \\ 1 & -1 & 2\end{array}\right)$Let $A=\left(\begin{array}{rrr}1 &amp; 1 &amp; -1 \\ 1 &amp; -1 &amp; 2\end{array}\right)$ a) Find the general solution $\mathbf{Z}$ of the homog ...
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$$\text { Let } A=\left[\begin{array}{ccc} 3 & 2 & -1 \\ 1 & 6 & 3 \\ 2 & -4 & 0 \end{array}\right]$$ Then the diagonal entries of the adjoint of A  are: \text { Let } A=\left\begin{array}{ccc} 3 &amp; 2 &amp; -1 \\ 1 &amp; 6 &amp; 3 \\ 2 &amp; -4 &amp; 0 \end{array}\right \end{equati ...
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Find the inverse of the matrix $$A=\left(\begin{array}{rrr} 2 & 0 & 4 \\ 1 & 2 & 7 \\ 6 & 4 & 22 \end{array}\right)$$
Find the inverse of the matrix $$A=\left(\begin{array}{rrr} 2 & 0 & 4 \\ 1 & 2 & 7 \\ 6 & 4 & 22 \end{array}\right)$$Find the inverse of the matrix $$A=\left(\begin{array}{rrr} 2 &amp; 0 &amp; 4 \\ 1 &amp; 2 &amp; 7 \\ 6 &amp; 4 &amp; 22 \end{array}\right)$$ ...
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What do you mean by the principal diagonal of the matrix?
What do you mean by the principal diagonal of the matrix?What do you mean by the principal diagonal of the matrix? ...
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"Every identity matrix is a diagonal matrix" True or False? Justify your answer.