ધારો કે $A = \begin{bmatrix} 5 & \sin^2 \theta & \cos^2 \theta \\ -\sin^2 \theta & -5 & 1 \\ \cos^2 \theta & 1 & 5 \end{bmatrix}$. તો $\det(A)$ ની મહત્તમ કિંમત શોધો.

  • A
    $-125$
  • B
    $200$
  • C
    $-\frac{255}{2}$
  • D
    $145$

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$\triangle ABC$ માં,જો $\left|\begin{array}{lll}a & b & c \\ b & c & a \\ c & a & b\end{array}\right|=0$ હોય,તો $\cos A \cos B+\cos B \cos C+\cos C \cos A=$

જો $z_1 = 2 + 3 \ i$ અને $z_2 = 3 + 2 \ i$,જ્યાં $i = \sqrt{-1}$ હોય,તો $\begin{bmatrix} z_1 & z_2 \\ -\bar{z}_2 & \bar{z}_1 \end{bmatrix} \begin{bmatrix} \bar{z}_1 & -z_2 \\ \bar{z}_2 & z_1 \end{bmatrix} =$

ધારો કે $A$ એ કોઈ $3 \times 3$ નોન-સિંગ્યુલર શ્રેણિક છે અને $(A - 3I)(A - 5I) = O$,જ્યાં $I = I_3$ અને $O = O_3$ છે. જો $\alpha A + \beta A^{-1} = 4I$ હોય,તો $\alpha + \beta$ ની કિંમત શોધો.

જો ${\Delta _r} = \left| {\begin{array}{*{20}{c}} r&{2r - 1}&{3r - 2} \\ {\frac{n}{2}}&{n - 1}&a \\ {\frac{1}{2}n\left( {n - 1} \right)}&{{{\left( {n - 1} \right)}^2}}&{\frac{1}{2}\left( {n - 1} \right)\left( {3n - 4} \right)} \end{array}} \right|$ હોય,તો $\sum\limits_{r = 1}^{n - 1} {{\Delta _r}} $ નું મૂલ્ય:

$\det \left[ \begin{array}{ccc} \frac{a^2+b^2}{c} & c & c \\ a & \frac{b^2+c^2}{a} & a \\ b & b & \frac{c^2+a^2}{b} \end{array} \right] = $

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