if the tangents on ellipse 4x²+y²=8 at the points (1,2) and (a,b) are perpendicular to each other
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if the tangents on ellipse 4x²+y²=8 at the points (1,2) and (a,b) are perpendicular to each other, then a² is equal to
(A)64/17. (B)2/17. (C)128/17. (D) 4/17