यदि $a$ और $b$ निश्चित शून्येतर स्थिरांक हैं,तो $\frac{a}{x^{4}}-\frac{b}{x^{2}}+\cos x$ का अवकलज $ma+nb-p$ है,जहाँ

  • A
    $m=4x^{3}, n=\frac{-2}{x^{3}}$ और $p=\sin x$
  • B
    $m=\frac{-4}{x^{5}}, n=\frac{2}{x^{3}}$ और $p=\sin x$
  • C
    $m=\frac{-4}{x^{5}}, n=\frac{-2}{x^{3}}$ और $p=\sin x$
  • D
    $m=4x^{3}, n=\frac{2}{x^{3}}$ और $p=-\sin x$

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