A tangent line \( L \) is drawn at the point \( (2,-4) \) on the P ...

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A tangent line \( L \) is drawn at the point \( (2,-4) \) on the
P parabola \( y^{2}=8 x \). If the line \( L \) is also tangent to the

W circle \( x^{2}+y^{2}=a \), then ' \( a \) ' is equal to
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