If the focus of the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 passes through the point (2,4) on the X axis, make the tangent of the circle x ^ 2 + y ^ 2 = 4 If the tangent points are a and B, and the line AB just passes through the right focus and upper vertex of the ellipse, what is the elliptic equation

If LZ only needs the answer
x²/4+y²=1

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