आव्यूह $A=\begin{bmatrix} 1 & 1 & 1 & 3 \\ 2 & 2 & -1 & 3 \\ 1 & 1 & -1 & 1 \end{bmatrix}$ की कोटि (Rank) क्या है?

  • A
    $3$
  • B
    $2$
  • C
    $4$
  • D
    $1$

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यदि $f(x) = \left| \begin{array}{ccc} -\sin x & 2 \sin 2x & 4 \cos^2 x \\ \cos x & 4 \sin^2 x & 2 \sin 2x \\ 0 & -\cos x & \sin x \end{array} \right|$ है, तो $f\left(\frac{5\pi}{4}\right) + f'\left(\frac{5\pi}{4}\right) = $

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