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If the circles x^2+y^2+2ax+c^2=0and x^2+...

If the circles `x^2+y^2+2ax+c^2=0`and `x^2+y^2+2by+c^2=0`touch each other,prove that `1/a^2+1/b^2=1/c^2`

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UNITED BOOK HOUSE-MCQ-EXERCISE
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