1.

If the normals at the four points (x_1,y_1),(x_2,y_2),(x_3,y_3) and (x_4,y_4) on the ellipsex^(2)/a^(2)+y^(2)/b^(2)=1 are concurrent, then the value of (sum_(i+1)^4x_1)(sum_(i=1)^(4)1/2)

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