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f'(x) para f(x) = (x^2 + 4)/(x^2 - 4), x != +/- 2. (Resp: -16x/(x^2-4)^2)
f'(x) para f(x) = (x^2 + 4)/(x^2 - 4), x != +/- 2. (Resp: -16x/(x^2-4)^2)
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