$\tan ^2(\sec ^{-1} 4) + \cot ^2(\operatorname{cosec}^{-1} 3)$ का मान है

  • A
    $15$
  • B
    $25$
  • C
    $23$
  • D
    $7$

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यदि $\tan ^{-1} x+\tan ^{-1} y+\tan ^{-1} z=\frac{\pi}{2}$ है,तो $1-x y-y z-z x$ का मान ज्ञात कीजिए।

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