यदि $I_{n}=\int_{0}^{\pi / 4} \tan ^{n} x d x$ है,जहाँ $n$ एक धनात्मक पूर्णांक है,तो $I_{10}+I_{8}$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{9}$
  • B
    $\frac{1}{8}$
  • C
    $\frac{1}{7}$
  • D
    $9$

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