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Two lines (L1 and L2) are drawn from poi...

Two lines `(L_1 and L_2)` are drawn from point `(alpha,alpha)` making an angle `45^@` with the lines `L_3=x+y-f(alpha)=0` and `L_4=x+y+f(alpha)=0.L_1` intersects `L_3` and `L_4` at A and B and `L_2` intersects `L_3` and `L_4` at C and D respectively `(|12a| > f(a)()`. If the area of trapezium ABDC is independent of `alpha`. If `f(alpha) = k^p alpha^q,` then `|pq|` is

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