Tag: applications of matrices and determinants
Questions Related to applications of matrices and determinants
If the matrix $\begin{bmatrix} 0 & 2\beta & \Upsilon \ \alpha & \beta & -\Upsilon \ \alpha & -\beta & \Upsilon \end{bmatrix}$is orthogonal, then
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$\alpha = \pm\dfrac{1}{\sqrt{2}}$
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$\beta = \pm\dfrac{1}{\sqrt{6}}$
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$\gamma = \pm\dfrac{1}{\sqrt{3}}$
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all of these
The inverse of the $\begin{bmatrix}- 1 & 5\ - 3 & 2\end{bmatrix}$ is
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$\frac{1}{13} \begin{bmatrix}
2 & - 5\
3 & - 1
\end{bmatrix}$ -
$\frac{1}{13} \begin{bmatrix}
- 1 & 5\
- 3 & 2
\end{bmatrix}$ -
$\frac{1}{13} \begin{bmatrix}
- 1 & - 3\
5 & 2
\end{bmatrix}$ -
$\frac{1}{13} \begin{bmatrix}
1 & 5\
3 & - 2
\end{bmatrix}$
The inverse of the matrix $\begin{bmatrix} 5 & -2 \ 3 & 1 \end{bmatrix}$ is
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$\dfrac { 1 }{ 11 } \begin{bmatrix} 1 & 2 \ -3 & 5 \end{bmatrix}$
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$\begin{bmatrix} 1 & 2 \ -3 & 5 \end{bmatrix}$
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$\dfrac { 1 }{ 13 } \begin{bmatrix} -2 & 5 \ 1 & 3 \end{bmatrix}$
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$\begin{bmatrix} 1 & 3 \ -2 & 5 \end{bmatrix}$
$\begin{array}{l} A=\left[ \begin{array}{l} 5\, \, \, \, \, -2 \ 3\, \, \, \, \, \, \, \, \, 1 \end{array} \right] \ \left| A \right| =5+6=11\ne 0 \ so,\, A\, \, is\, \, \, non-\sin gular\, ,\, { A^{ -1 } }\, \, is\, \, exist \ so,m\, { A _{ 11 } }=1,\, \, \, \, \, { A _{ 12 } }=-3,\, \, \, \, { A _{ 21 } }=2,\, \, \, \, \, \, { A _{ 22 } }=5 \ A=\left( { \begin{array} { *{ 20 }{ c } }1 & { -3 } \ 2 & 5 \end{array} } \right) \Rightarrow AdjA=\left( { \begin{array} { *{ 20 }{ c } }1 & 2 \ { -3 } & 5 \end{array} } \right) \ { A^{ -1 } }=\frac { 1 }{ { \left| A \right| } } adjA\, \, \, \, \Rightarrow \, \, \, \, \frac { 1 }{ { 11 } } \left( { \begin{array} { *{ 20 }{ c } }1 & 2 \ { -3 } & 5 \end{array} } \right) \end{array}$
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$\displaystyle \begin{bmatrix}1 &0 \0 &1\end{bmatrix}$
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$\displaystyle \begin{bmatrix}-1 &0 \0 &-1\end{bmatrix}$
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$\displaystyle \begin{bmatrix}-1 &0 \0 &1\end{bmatrix}$
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$\displaystyle \begin{bmatrix}0 &1 \1&0\end{bmatrix}$
Reflection of matrix $P(x,y)$ through the line $y=mx$ making an angle $\theta$ with $x-$axis is
$\begin{bmatrix} \cos 2\theta & \sin { 2\theta } \ \sin{ 2\theta } & -\cos { 2\theta } \end{bmatrix}$
Given line is $y=x$ which makes an angle of $45^{\circ}$ with $x-$axis
What is the inverse of the matrix
$A=\begin{bmatrix} \cos { \theta } & \sin { \theta } & 0 \ -\sin { \theta } & \cos { \theta } & 0 \ 0 & 0 & 1 \end{bmatrix}$ ?
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$\begin{bmatrix} \cos { \theta } & -\sin { \theta } & 0 \ \sin { \theta } & \cos { \theta } & 0 \ 0 & 0 & 1 \end{bmatrix}$
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$\begin{bmatrix} \cos { \theta } & 0 & -\sin { \theta } \ 0 & 1 & 0 \ \sin { \theta } & 0 & \cos { \theta } \end{bmatrix}$
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$\begin{bmatrix} 1 & 0 & 0 \ 0 & \cos { \theta } & -\sin { \theta } \ 0 & \sin { \theta } & \cos { \theta } \end{bmatrix}$
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$\begin{bmatrix} \cos { \theta } & \sin { \theta } & 0 \ -\sin { \theta } & \cos { \theta } & 0 \ 0 & 0 & 1 \end{bmatrix}$