JEE Advanced 2018 Mathematics question

MathematicsEllipseJEE Advanced 2018

Consider two straight lines, each of which is tangent to both the circle and the parabola . Let these lines intersect at the point . Consider the ellipse whose center is at the origin and whose semi-major axis is . If the length of the minor axis of this ellipse is , then which of the following statement(s) is (are) TRUE?

Answer: (A),(C)

Solution

A tangent to is ; touching the circle requires . The tangents and meet at , so and . (A) $=1-=Missing argument for \frac\frac12⇒

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Question ID VK-026793