It is known that the left and right focal points of ellipse C: x2a2 + y2b2 = 1 (A & gt; B & gt; 0) are F1 and F2 respectively, the eccentricity e = 12, and the line y = x + 2 passes through the left focal point F1. (1) find the equation of ellipse C; (2) if P is a point on ellipse C, find the range of ∠ f1pf2

It is known that the left and right focal points of ellipse C: x2a2 + y2b2 = 1 (A & gt; B & gt; 0) are F1 and F2 respectively, the eccentricity e = 12, and the line y = x + 2 passes through the left focal point F1. (1) find the equation of ellipse C; (2) if P is a point on ellipse C, find the range of ∠ f1pf2

(1) If the coordinate of the intersection of the line y = x + 2 and X is (- 2,0), then the coordinate of F1 is (- 2,0) (2) let the focal length be 2c, then C = 2. ∵ e = CA = 12 ∵ a = 4, B2 = a2-c2 = 12 The equation of ellipse is x216 + y212 = 1 (6 points) (2) when p is at the right vertex of the ellipse, ∠ f1pf2