y = x/(√(1 + x²)
y*(√(1 + x²) = x
y²*(1 + x²) = x²
y² + x²y² = x²
x²(y² - 1) = -y²
x² = -y²/(y² - 1)
x² = y²/(1 - y²)
f-¹(x) = ± x/√(1 - x²)
pronto
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Verified answer
y = x/(√(1 + x²)
y*(√(1 + x²) = x
y²*(1 + x²) = x²
y² + x²y² = x²
x²(y² - 1) = -y²
x² = -y²/(y² - 1)
x² = y²/(1 - y²)
f-¹(x) = ± x/√(1 - x²)
pronto