फलन $f(x) = 2x^3 - 9x^2 + 12x + 29$ कब एकदिष्ट ह्रासमान (monotonically decreasing) है?

  • A
    $x < 2$
  • B
    $x > 2$
  • C
    $x > 1$
  • D
    $1 < x < 2$

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