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Anonymous
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(3x - y)(3x - 5y) and (2x + 1)(2x + 11)
3xy3
1/5y2+9
If y = 2x+1 is a tangent line to the circle 5y^2 +5x^2 = 1 then the point of contact is at (-2/5, 1/5) because it has equal roots
10y2 - 15y2 = -5y2