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If the circles x^2+y^2-9=0 and x^2+y^2+2...

If the circles `x^2+y^2-9=0` and `x^2+y^2+2a x+2y+1=0` touch each other, then `alpha` is (a)`-4/3` (b) 0 (c) 1 (d) `4/3`

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CENGAGE ENGLISH-CONIC SECTIONS-All Questions
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