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Alternatif soal:
f(x) = x² - 1/x + 1
maka:
f '(x) = 2x + 1/x²
Alternatif soal
f(x) = (x² -1)/(x + 1)
maka:
f(x)= (x + 1)(x - 1)/(x + 1)
= x - 1
f '(x) = 1