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[" 31.If the equation of one tangent to ...

[" 31.If the equation of one tangent to the circle with centre "],[(2,-1)" from the origin is "3x+y=0" then the equation "],[" of the other tangent through the origin is "],[[" a) "x+3y=0," b) "3x-y=0],[" c) "x+2y=0," d) "x-3y=0]]

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