જો $\left|\begin{array}{ccc}1+\sin ^{2} \theta & \cos ^{2} \theta & 4 \sin 2 \theta \\ \sin ^{2} \theta & 1+\cos ^{2} \theta & 4 \sin 2 \theta \\ \sin ^{2} \theta & \cos ^{2} \theta & 4 \sin 2 \theta-1\end{array}\right|=0$ અને $0 < \theta < \frac{\pi}{2}$ હોય,તો $\cos 4 \theta$ ની કિંમત શોધો.

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $0$
  • C
    $\frac{-1}{2}$
  • D
    $\frac{1}{2}$

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જો $\left|\begin{array}{ccc}x & x^2 & 1+x^3 \\ y & y^2 & 1+y^3 \\ z & z^2 & 1+z^3\end{array}\right|=0$ અને $x \neq y \neq z$ હોય, તો $1+x y z$ ની કિંમત શોધો.

જો $x, y, z$ સમાન ન હોય અને $\neq 0, \neq 1$ હોય,તો $\begin{vmatrix} \log x & \log y & \log z \\ \log 2x & \log 2y & \log 2z \\ \log 3x & \log 3y & \log 3z \end{vmatrix}$ નું મૂલ્ય કેટલું થાય?

નિશ્ચાયક $\left| \begin{array}{ccc} 2 & 8 & 4 \\ -5 & 6 & -10 \\ 1 & 7 & 2 \end{array} \right|$ નું મૂલ્ય શોધો.

નિશ્ચાયકના ગુણધર્મોનો ઉપયોગ કરીને સાબિત કરો કે:
$\left|\begin{array}{lll}x & x^{2} & y z \\ y & y^{2} & z x \\ z & z^{2} & x y\end{array}\right|=(x-y)(y-z)(z-x)(x y+y z+z x)$

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નિશ્ચાયકનું મૂલ્ય શોધો: $\left| \begin{array}{ccc} (a^x + a^{-x})^2 & (a^x - a^{-x})^2 & 1 \\ (b^x + b^{-x})^2 & (b^x - b^{-x})^2 & 1 \\ (c^x + c^{-x})^2 & (c^x - c^{-x})^2 & 1 \end{array} \right|$

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