यदि $\sin \alpha = \frac{2pq}{p^2 + q^2}$ है,तो $\sec \alpha - \tan \alpha = $

  • A
    $\frac{p-q}{p+q}$
  • B
    $\frac{pq}{p^2 + q^2}$
  • C
    $\frac{p+q}{p-q}$
  • D
    इनमें से कोई नहीं

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