If the line x-2y=12 is tangent to the ellipse x^2/a^2+y^2/b^2 =1 at the point (3,-9/2) then the length of latus rectum be=?
If the line x-2y=12 is tangent to the ellipse x^2/a^2+y^2/b^2 =1 at the point (3,-9/2) then the length of latus rectum be=?
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