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Q)

Find the common tangent of $x^2+y^2=4$ and $2x^2+y^2=2$.

$\begin{array}{1 1}(a)\;x+y=0\\(b)\;x^2+y^2=0\\(c)\;x^2+y^2=1\\(d)\;\text{No common tangent}\end{array}$

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