यदि $(\sec A + \tan A)(\sec B + \tan B)(\sec C + \tan C) = (\sec A - \tan A)(\sec B - \tan B)(\sec C - \tan C)$ है,तो प्रत्येक पक्ष का मान क्या होगा?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $1$ या $-1$

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