समीकरण $\sin^{-1} 2x = \cos^{-1} x$ के सभी हलों का योग ज्ञात कीजिए।

  • A
    $0$
  • B
    $\frac{2}{\sqrt{5}}$
  • C
    $\frac{1}{\sqrt{5}}$
  • D
    $\frac{-1}{\sqrt{5}}$

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