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For a given parabola y^(2)=4ax ,two va...

For a given parabola `y^(2)=4ax` ,two variable chords PQ and RS at right angles are drawn through the fixed point `A(x_(1),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 & S from A ,then the value of `(1)/(r_(1)r_(2))+(1)/(r_(3)r_(4))`

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