જો $A = \begin{bmatrix} \cos \alpha & \sin \alpha \\ -\sin \alpha & \cos \alpha \end{bmatrix}$ અને $A \text{ adj } A = \begin{bmatrix} k & 0 \\ 0 & k \end{bmatrix}$ હોય,તો $k$ ની કિંમત શું થાય :-

  • A
    $0$
  • B
    $1$
  • C
    $\sin \alpha \cos \alpha$
  • D
    $\cos 2\alpha$

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Similar Questions

જો $\begin{bmatrix} 2 & 1 \\ 3 & 2 \end{bmatrix} A \begin{bmatrix} -3 & 2 \\ 5 & -3 \end{bmatrix} = \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$ હોય,તો $A=$

જો $A = \begin{bmatrix} 1 & 5 & 2 \\ 4 & 1 & 3 \\ 2 & 6 & 3 \end{bmatrix}$ હોય, તો $|(\operatorname{Adj} A)^{-1}| = $

જો $A = \begin{bmatrix} 0 & 1+2i & i-2 \\ -1-2i & 0 & K \\ 2-i & -7 & 0 \end{bmatrix}$ અને $A^{-1}$ અસ્તિત્વ ધરાવતું ન હોય,તો $K = $ (જ્યાં $i = \sqrt{-1}$)

જો $A = \begin{bmatrix} 2 & -3 \\ 5 & 4 \end{bmatrix}$ હોય,તો $A^{-1} = $ . . . . . . .

જો $A = \begin{bmatrix} 1 & 2 & 3 \\ 1 & 4 & 9 \\ 1 & 8 & 27 \end{bmatrix}$ હોય,તો $|adj\, A|$ નું મૂલ્ય શોધો.

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