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For all real values of `m ,` the straight line `y=m x+sqrt(9m^2-4)` is a tangent to which of the following certain hyperbolas? (a)`9x^2+4y^2=36` (b) `4x^2+9y^2=36` (c)`9x^2-4y^2=36` (d) `4x^2-9y^2=36`

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