જો $f(x)=\cos ^{-1}\left[\frac{1}{\sqrt{13}}(2 \cos x-3 \sin x)\right]$ હોય,તો $f^{\prime}(0.5)$ ની કિંમત શોધો.

  • A
    $0.5$
  • B
    $1$
  • C
    $0$
  • D
    $-1$

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