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The length of the sides of the square wh...

The length of the sides of the square which can be made by four perpendicular tangents `P Qa n dP R` are drawn to the ellipse `(x^2)/4+(y^2)/9=1` . Then the angle subtended by `Q R` at the origin is `tan^(-1)(sqrt(6))/(65)` (b) `tan^(-1)(4sqrt(6))/(65)` `tan^(-1)(8sqrt(6))/(65)` (d) `tan^(-1)(48sqrt(6))/(455)`

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