त्रिकोणमितीय समीकरण $\sin ^{-1} x = 2 \sin ^{-1} 2a$ का वास्तविक हल है, यदि

  • A
    $|a| > \frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{2 \sqrt{2}} < |a| < \frac{1}{\sqrt{2}}$
  • C
    $|a| > \frac{1}{2 \sqrt{2}}$
  • D
    $|a| \leq \frac{1}{2 \sqrt{2}}$

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