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A straight line touches the circle $x^{2}+y^{2}=2a^{2}$ and also the parabola $y^{2}=8ax.$ Then  the equation of the straight line is

  1. $y=\pm x$
  2. $y=\pm(x+a)$
  3. $y=\pm(x+2a)$
  4. $y=\pm(x-21)$
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