\( x-2 y+4=0 \) is a common tangent to \( y^{2}=4 x \) and \( \frac{x^{2}}{4}+\frac{y^{2}}{b^{2}}...

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\( x-2 y+4=0 \) is a common tangent to \( y^{2}=4 x \) and \( \frac{x^{2}}{4}+\frac{y^{2}}{b^{2}}...
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