Let \( L \) be a common tangent line to the curves \( \mathrm{P}^{1...

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Let \( L \) be a common tangent line to the curves
\( \mathrm{P}^{18:} \) \( 4 x^{2}+9 y^{2}=36 \) and \( (2 x)^{2}+(2 y)^{2}=31 \). Then the

W square of the slope of the line \( L \) is
\( (1) \cdot 2 \)
(2) 3
(3) 4
(4) 5
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