A vertical line passing through the point (h,0) intersects the ellipse x2/4+y2/3=1 at the points P and Q. Let the tangents to the ellipse at P and Q meet at the point R. If Δ(h) = area of the triangle PQR, Δ1=max1/2≤h≤1Δ(h) and Δ2=min1/2≤h≤1Δ(h), then 58Δ1−8Δ2 =