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If `(alpha +beta )` and `(alpha - beta )` are the eccentric angles of the points P and Q respectively on the ellipse `(x^(2))/(a^(2)) + (y^(2))/(b^(2)) = 1 ` show that the equation of the chord PQ is `(x)/(a) cos alpha+(y)/(b)sin alpha = cos beta . `

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CHHAYA PUBLICATION-ELLIPSE-Very Short Answer Type Qustions
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