For a given parabola \( y^{2}=4 a x \) two variable chords \( P Q \) and \( R S \) at right angl... VIDEO
For a given parabola \( y^{2}=4 a x \) two variable chords \( P Q \) and \( R S \) at right angles are drawn through the fixed point \( A\left(x_{1}\right. \), \( y_{1} \) ) inside the parabola, making variable angles \( \theta \) and \( \alpha \) with \( x \)-axis. If \( r_{1}, r_{2}, r_{3}, r_{4} \) are distances of \( P, Q, R \) and \( S \) from \( A \), then the value of \( \frac{1}{r_{1} r_{2}}+\frac{1}{r_{3} r_{4}} \)https://bit.ly/YTAI_PWAP https://www.pw.live
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