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y = [1+√(1-x)]/[1-√(1-x)], y - y√(1-x) = 1+√(1-x),
(y+1)√(1-x) = y-1, √(1-x) =(y-1)/(y+1),
1-x = (y-1)^2/(y+1)^2, x =1 - (y-1)^2/(y+1)^2 = 4y/(y+1)^2
反函数 y = 4x/(x+1)^2, x ≠ -1
(y+1)√(1-x) = y-1, √(1-x) =(y-1)/(y+1),
1-x = (y-1)^2/(y+1)^2, x =1 - (y-1)^2/(y+1)^2 = 4y/(y+1)^2
反函数 y = 4x/(x+1)^2, x ≠ -1
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