${\left[ {\begin{array}{*{20}{c}}{ - 6}&5\\{ - 7}&6\end{array}} \right]^{ - 1}}$ =

  • A
    $\left[ {\begin{array}{*{20}{c}}{ - 6}&5\\{ - 7}&6\end{array}} \right]$
  • B
    $\left[ {\begin{array}{*{20}{c}}6&{ - 5}\\{ - 7}&6\end{array}} \right]$
  • C
    $\left[ {\begin{array}{*{20}{c}}6&5\\7&6\end{array}} \right]$
  • D
    $\left[ {\begin{array}{*{20}{c}}6&{ - 5}\\7&{ - 6}\end{array}} \right]$

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જો $A = \begin{bmatrix} \sin \alpha & -\cos \alpha \\ \cos \alpha & \sin \alpha \end{bmatrix}$ અને $A + A^{-1} = I$ હોય,તો $\alpha =$

જો $P = \begin{bmatrix} 1 & \alpha & 3 \\ 1 & 3 & 3 \\ 2 & 4 & 4 \end{bmatrix}$ એ $3 \times 3$ શ્રેણિક $A$ નો સહઅવયજ શ્રેણિક (adjoint) હોય અને $\det(A) = 4$ હોય, તો $\alpha$ ની કિંમત શોધો.

જો $\operatorname{det}(AB)=(\operatorname{det} A)(\operatorname{det} B)$ અને $A$ એ $3 \times 3$ કક્ષાનો નોન-સિંગ્યુલર શ્રેણિક હોય,તો $\operatorname{det}(\operatorname{adj} A)=$

જો $A = \begin{bmatrix} 1 & \tan x \\ -\tan x & 1 \end{bmatrix}$ હોય,તો $A^{T} A^{-1} = $

જો $A = \begin{bmatrix} 4 & 0 & 0 \\ 0 & 3 & 0 \\ 0 & 0 & 2 \end{bmatrix}$ અને $B = \begin{bmatrix} 1 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 3 \end{bmatrix}$ હોય,તો $(A+B)^{-1} = $ . . . . . . .

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