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k que torna f(x) = \begincases e^(kx), 0 <= x < 4 }, {x+3, 4 <= x <= 8 \endcases contínua
k que torna f(x) = \begincases e^(kx), 0 <= x < 4 }, {x+3, 4 <= x <= 8 \endcases contínua
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