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Tangents are drawn to x^2+y^2=1 from any...

Tangents are drawn to `x^2+y^2=1` from any arbitrary point `P` on the line `2x+y-4=0` . The corresponding chord of contact passes through a fixed point whose coordinates are
(a) `(1/2,1/2)` (b) `(1/2,1)`(c) `(1/2,1/4)` (d) `(1,1/2)`

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