यदि $4 \sin ^{-1} x + 6 \cos ^{-1} x = 3 \pi$,जहाँ $-1 \leq x \leq 1$,तो $x =$

  • A
    $1/2$
  • B
    $1/\sqrt{2}$
  • C
    $-1/2$
  • D
    $0$

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$\sin ^{-1}\left(-\frac{1}{2}\right)+\cos ^{-1}\left(-\frac{\sqrt{3}}{2}\right)$ का मान ज्ञात कीजिए।

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