વિધેય $f(x) = x \cdot \cos x$ નું દ્વિતીય ક્રમનું વિકલિત શોધો.

  • A
    $-(x \cos x + 2 \sin x)$
  • B
    $x \cos x + 2 \sin x$
  • C
    $-x \cos x + 2 \sin x$
  • D
    $x \cos x - 2 \sin x$

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