If ${\sin ^2}\theta = \frac{{{x^2} + {y^2} + 1}}{{2x}}$, then $x$ must be

  • A

    $-3$

  • B

    $-2$

  • C

    $1$

  • D

    None of these

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  • [IIT 1979]

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$-47^{\circ} 30^{\prime}$