If $\sin^{-1} x = \theta + \beta$ and $\sin^{-1} y = \theta - \beta$,then $1 + xy = $

  • A
    $\sin^2 \theta + \sin^2 \beta$
  • B
    $\sin^2 \theta + \cos^2 \beta$
  • C
    $\cos^2 \theta + \cos^2 \beta$
  • D
    $\cos^2 \theta + \sin^2 \beta$

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