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(f o g)(x) = f(g(x))
= f(1-2x)
= (1-2x)² - (1-2x) + 3
= 1 - 4x + 4x² -1 + 2x +3
= 4x² - 2x +3
Jadi (f o g)(x) = 4x² - 2x +3