1.

For all real values of m' the straight line y=mx + sqrt(9m^(2)-4) is a tangent to the curve

Answer»

`9x^(2)+4y^(2)=36`
`4x^(2)+9Y^(2)=36`
`9x^(2)-4y^(2)=36`
`4x^(2)-9y^(2)=36`

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