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If the two circles x^2 +y^2 +2gx+2fy = 0 and x^2 +y^2 +2g1 x+2f1 y = 0 touch each other, then

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If the two circles x2 +y2 +2gx+2fy = 0 and x2 +y2 +2g1 x+2f1 y = 0 touch each other, then

a. f1 g = fg1

b. ff1 = gg1

c. f2 +g2 = f12 + g12

d. none of these

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1 Answer

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by (54.4k points)

Correct option is  a. f1 g = fg1

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