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The tangent and normal at any point P of...

The tangent and normal at any point P of an ellipse `x^(2)/a^(2)+y^(2)/b^(2)=1` cut its major axis in point Q and R respectively. If QR=a prove that the eccentric angle of the point P is given by `e^(2)cos^(2)phi+cosphi-1=0`

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