एक फलन $f: R \rightarrow R$ इस प्रकार है कि $y f(x+y) + \cos(mxy) = 1 + y f(x)$। यदि $m=2$ है,तो $f'(x) =$

  • A
    $-2 \sin(2xy)$
  • B
    $4x$
  • C
    $\frac{2 \sin(2xy)}{y}$
  • D
    $2x^2$

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