If the slope of one of the lines given by \( 36 x^{2}+2 h x y+72 y^{2}=0 \) is four times the ot...

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If the slope of one of the lines given by \( 36 x^{2}+2 h x y+72 y^{2}=0 \) is four times the other, then \( h^{2}= \)
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