मान लीजिए $f(x)=7 \tan^8 x + 7 \tan^6 x - 3 \tan^4 x - 3 \tan^2 x$ के लिए,$I_1 = \int_0^{\pi/4} f(x) \, dx$ और $I_2 = \int_0^{\pi/4} x f(x) \, dx$ है। तो $7 I_1 + 12 I_2$ का मान ज्ञात कीजिए:

  • A
    $2 \pi$
  • B
    $\pi$
  • C
    $1$
  • D
    $2$

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