यदि $12a + 5b = 9$,जहाँ $a, b \in R$ है,तो $a^2 + b^2$ का न्यूनतम मान क्या होगा?

  • A
    $\frac{81}{169}$
  • B
    $\frac{169}{81}$
  • C
    $\frac{9}{13}$
  • D
    $\frac{31}{9}$

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यदि $(\sec \alpha + \tan \alpha )(\sec \beta + \tan \beta )(\sec \gamma + \tan \gamma ) = \tan \alpha \tan \beta \tan \gamma $ है,तो $(\sec \alpha - \tan \alpha )(\sec \beta - \tan \beta )(\sec \gamma - \tan \gamma ) = $

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