The common tangents to the circles \( x^{2}+y^{2}+2 x=0 \) and \( x^{2}+y^{2}-6 x=0 \) form a tr...

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The common tangents to the circles \( x^{2}+y^{2}+2 x=0 \) and \( x^{2}+y^{2}-6 x=0 \) form a triangle which is
a. Equilateral
b. Right angled
c. Isosceles
d. Scalene
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