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Verified answer
Jawabf(x)= 2x - x²
t = 2x - x²
x² - 2x = - t
(x - 1)² = 1 - t
x - 1 = +-√(1 - t)
x = 1 +- √(1- t)
f⁻¹ (x) = 1 +- √(1 - x)