Through the right focus F2 of the ellipse x ^ 2 / 4 + y ^ 2 / 3 = 1, make a straight line with an inclination angle of pi / 4 to intersect the ellipse and two points a and B. find the length of the chord ab

Through the right focus F2 of the ellipse x ^ 2 / 4 + y ^ 2 / 3 = 1, make a straight line with an inclination angle of pi / 4 to intersect the ellipse and two points a and B. find the length of the chord ab

Let a (x1, Y1), B (X2, Y2), then X1 + x2 = 8 / 7, X1 * x2 = - 8 / 7, so | ab | ^ 2 = (x2-x1) ^ 2 + (y2-y1) ^ 2 = 2 (x2-x1) ^ 2 = 2