MCQ
$\cos \left(2 \sin ^{-1} x\right)=\frac{1}{5}$ તો $x=$_______.
- A$\pm \sqrt{\frac{3}{5}}$
- B$\pm \frac{1}{\sqrt{5}}$
- ✓$\pm \sqrt{\frac{2}{5}}$
- D$\pm \frac{2}{\sqrt{5}}$
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