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[" A common tangent to "9x^(2)-16y^(2)=144" and "x^(2)+y^(2)=9" is "],[[" (a) "y=(3)/(8)x+(15)/(4)," (b) "y=3,," 2"x+(15)/(-5)]quad " (c) "y=sqrt((3)/(4))x+1]

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