यदि $\alpha$ और $\beta$ सभी $x \in [-1, 1]$ के लिए $f(x)=(\sin ^{-1} x)^2+(\cos ^{-1} x)^2$ के न्यूनतम और अधिकतम मान हैं,तो $8(\alpha+\beta)=$

  • A
    $\pi^2$
  • B
    $11 \pi^2$
  • C
    $9 \pi^2$
  • D
    $25 \pi^2$

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यदि $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=3 \pi$ है,तो

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