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[" 64.The pair of tangents from "(2,1)" ...

[" 64.The pair of tangents from "(2,1)" to the circle "],[x^(2)+y^(2)=4" is "],[[" 1) "3x^(2)+4xy+16x+8y+20=0],[" 2) "3x^(2)+4xy+16x-8y+20=0],[" 3) "3x^(2)+4xy-16x-8y+20=0],[" 4) "3x^(2)-4x-16x+8y-20=0]]

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