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If the tangent and normal to the ellipse `x^2 + 4y^2 = 4` at point `P (theta)` meets the major axes in `Q and R` respectively, and `QR = 3`, then (A) `cos theta = 1 /sqrt(3)` (B) `cos theta= 1/3` (C) `cos theta = 2/3` (D) `costheta = (-2/(3)`

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