જો $3 f(\cos x) + 2 f(\sin x) = 5 x$ હોય,તો $f^{\prime}(\cos x) + f^{\prime}(\sin x) =$

  • A
    $-5(\sin x + \cos x)$
  • B
    $-5 \sin x \cos x$
  • C
    $\frac{-5}{\sin x} - \frac{5}{\cos x}$
  • D
    $\frac{5}{\sin x} + \frac{5}{\cos x}$

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