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Question

$x^{2} + y^{2} + 2 x - 2 y + 1 = 0$ বৃত্তটি $x^{2} + y^{2} = a^{2}$ বৃত্তকে অন্তঃস্থভাবে স্পর্শ করলে a এর মান কত?

1

√2

-√2

1+√2

1-√2

ANSWER : 0

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