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The chord AC of the parabola y^(2)=4ax s...

The chord AC of the parabola `y^(2)=4ax` subtends an angle of `90^(@)` at points B and D on the parabola. If points A, B, C and D are represented by `(at_(i)^(2), 2at_(i)), i=1,2,3,4` respectively, then find the value of `|(t_(2)+t_(4))/(t_(1)+t_(3))|`.

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