જો $\left|\begin{array}{cc}\sin ^2 \theta & \cos ^2 \theta \\ -\cos ^2 \theta & \sin ^2 \theta\end{array}\right| = $ . . . . . . .

  • A
    $\cos 2 \theta$
  • B
    $\sin^4 \theta + \cos^4 \theta$
  • C
    $1 - \sin^2 2 \theta$
  • D
    $\sin^2 2 \theta$

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જો $\left| {\begin{array}{*{20}{c}}{{x^2} + x}&{x + 1}&{x - 2}\\ {2{x^2} + 3x - 1}&{3x}&{3x - 3}\\ {{x^2} + 2x + 3}&{2x - 1}&{2x - 1}\end{array}} \right| = Ax - 12$ હોય,તો $A$ ની કિંમત શોધો.

જો $px^4 + qx^3 + rx^2 + sx + t \equiv \left| \begin{array}{ccc} x^2 + 3x & x - 1 & x + 3 \\ x + 1 & 2 - x & x - 3 \\ x - 3 & x + 4 & 3x \end{array} \right|$ હોય,તો $t =$

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$(2, -6)$,$(5, 4)$ અને $(k, 4)$ શિરોબિંદુઓ ધરાવતા ત્રિકોણનું ક્ષેત્રફળ $35$ ચોરસ એકમ છે,તો $k$ ની કિંમત . . . . . . છે.

જો $a, b, c$ એ $A.P.$ માં હોય,તો $\left|\begin{array}{ccc} 2y+4 & 5y+7 & 8y+a \\ 3y+5 & 6y+8 & 9y+b \\ 4y+6 & 7y+9 & 10y+c \end{array}\right|$ ની કિંમત શોધો.

$\left| {\begin{array}{*{20}{c}}{{{\log }_3}512}&{{{\log }_4}3}\\{{{\log }_3}8}&{{{\log }_4}9}\end{array}} \right| \times \left| {\begin{array}{*{20}{c}}{{{\log }_2}3}&{{{\log }_8}3}\\{{{\log }_3}4}&{{{\log }_3}4}\end{array}} \right| = $

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