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The chords of contact of the pair of tangents drawn from each point on the line `2x + y=4` to the circle `x^2 + y^2=1` pass through the point (a,b) then 4(a+b) is

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A point on the line `2x+y=4` is of the form `(h,4-2h)` Equation of the chord of contact is T=0 i.e.
The line passes through the point of intersection of `4y-1=0 and x-2y=0` i.e. through the point `((1)/(2),(1)/(4))`.
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