यदि $f(x) = \left| \begin{array}{ccc} 2 \cos x & 1 & 0 \\ x - \frac{\pi}{2} & 2 \cos x & 1 \\ 0 & 1 & 2 \cos x \end{array} \right|$ है,तो $f^{\prime}(\pi)$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $2$
  • C
    $\frac{\pi}{2}$
  • D
    $\pi - 6$

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यदि आव्यूह $A = \begin{bmatrix} 1 & 2 & 3 & 0 \\ 2 & 4 & 3 & 2 \\ 3 & 2 & 1 & 3 \\ 6 & 8 & 7 & \alpha \end{bmatrix}$ की कोटि (rank) $3$ है,तो $\alpha$ का मान ज्ञात कीजिए।

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