ધારો કે $f(x + y) = f(x)f(y)$ અને $f(x) = 1 + \sin(3x)g(x)$,જ્યાં $g(x)$ સતત છે,તો $f'(x)$ શું થાય?

  • A
    $f(x)g(0)$
  • B
    $3g(0)$
  • C
    $f(x)\cos(3x)$
  • D
    $3f(x)g(0)$

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