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2016-02-12T00:32:20+08:00
F(x) = x² + 1
f g(x) = g(x)² + 1
fg(x) = x² + 4x + 5
g(x)² + 1 = x² + 4x + 5
g(x)² = x² + 4x + 4
g(x) = √ (x² + 4x + 4 )
g(x) = x + 2x + 2