$\frac{x^2-1}{(x^2+1)(x^2+2)}$ ના પાવર શ્રેણી વિસ્તરણમાં $x^4$ નો સહગુણક શોધો.

  • A
    $\frac{15}{16}$
  • B
    $\frac{15}{4}$
  • C
    $-\frac{13}{8}$
  • D
    $\frac{77}{324}$

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