If beta is one of the angles between the...

If `beta` is one of the angles between the normals to the ellipse, `x^2+3y^2=9` at the points `(3 cos theta, sqrt(3) sin theta)" and "(-3 sin theta, sqrt(3) cos theta), theta in (0,(pi)/(2))`, then `(2 cos beta)/(sin 2 theta)` is equal to:

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