फलन $f(x) = x^{20}$ का द्वितीय कोटि का अवकलज ज्ञात कीजिए।

  • A
    $380 x^{18}$
  • B
    $400 x^{18}$
  • C
    $20 x^{19}$
  • D
    $19 x^{18}$

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