यदि $f(x) = 10 \cos x + (13 + 2x) \sin x$ है, तो $f''(x) + f(x)$ का मान ज्ञात कीजिए।

  • A
    $4 \cos x$
  • B
    $4 \sin x$
  • C
    $2 \cos x$
  • D
    $2 \sin x$

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