$x$ ની સાપેક્ષમાં $\frac{3x^4 - 1}{(x^4 + x + 1)^2}$ નું વિકલિત (primitive) શું છે?

  • A
    $\frac{x}{x^4 + x + 1} + c$
  • B
    $-\frac{x}{x^4 + x + 1} + c$
  • C
    $\frac{x + 1}{x^4 + x + 1} + c$
  • D
    $-\frac{x + 1}{x^4 + x + 1} + c$

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