circle

Related Questions

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• $a{{x}^{2}}+2{{y}^{2}}+2bxy+2x-y+c=0$ represents a circle through the origin, if

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• If the circle ${{x}^{2}}+{{y}^{2}}=4$ bisects the circumference of the circle ${{x}^{2}}+{{y}^{2}}-2x+6y+a=0$ , then a equals

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