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k such that f(x)=e^(kx) para 0 <= x < 4 and f(x)=x+3 para 4 <= x <= 8 seja contínua
k such that f(x)=e^(kx) para 0 <= x < 4 and f(x)=x+3 para 4 <= x <= 8 seja contínua
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