જો $f(x) = \int \frac{5x^{8} + 7x^{6}}{(x^{2} + 1 + 2x^{7})^{2}} dx$,$(x \geq 0)$,$f(0) = 0$ અને $f(1) = \frac{1}{K}$ હોય,તો $K$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $2$
  • C
    $4$
  • D
    $6$

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