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[" 1.The line "bx+my+n=0" will be a tang...

[" 1.The line "bx+my+n=0" will be a tangent to the circle "],[x^(2)+y^(2)=a^(2)" iff "],[[" (a) "n^(2)(1^(2)+m^(2))=a^(2)," (b) "a^(2)(1^(2)+m^(2))=n^(2)],[" (c) "n(1+m)=a," (d) "a(1+m)=n]]

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