$(-3, 0)$,$(3, 0)$ અને $(0, k)$ શિરોબિંદુઓ ધરાવતા ત્રિકોણનું ક્ષેત્રફળ $9$ ચોરસ એકમ છે. $k$ ની કિંમત શોધો.

  • A
    $6$
  • B
    $3$
  • C
    $-6$
  • D
    $-3$

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જો $\left| \begin{array}{ccc} \cos 2x & \sin^2 x & \cos 4x \\ \sin^2 x & \cos 2x & \cos^2 x \\ \cos 4x & \cos^2 x & \cos 2x \end{array} \right| = a_0 + a_1 \sin x + a_2 \sin^2 x + \dots$ હોય,તો $a_0$ ની કિંમત શોધો.

જો $a_i, b_i, c_i \in \mathbb{R}$ જ્યાં $i=1, 2, 3$ અને $x \in \mathbb{R}$ તથા $\begin{vmatrix} a_1+b_1 x & a_1 x+b_1 & c_1 \\ a_2+b_2 x & a_2 x+b_2 & c_2 \\ a_3+b_3 x & a_3 x+b_3 & c_3 \end{vmatrix} = 0$ હોય,તો:

જો $\omega$ એ એકમનું ઘનમૂળ હોય અને $\Delta = \begin{vmatrix} 1 & 2\omega \\ \omega & \omega^2 \end{vmatrix}$ હોય,તો $\Delta^2$ ની કિંમત શોધો.

જો $\left|\begin{array}{ccc}2 & 2k & 1 \\ 1 & k-1 & 1 \\ 2 & 1 & k+1\end{array}\right|=Ak^2+Bk+C$ હોય,તો $A+B+C=$

નિશ્ચાયકનું મૂલ્ય શોધો: $\left|\begin{array}{cc}\sin \frac{11 \pi}{36} & \cos \frac{11 \pi}{36} \\\sin \frac{2 \pi}{9} & \cos \frac{2 \pi}{9}\end{array}\right|$.

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