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plot k(t)=0.0004 + 0.03/1000 - 0.03/1000 * e^(-1000/30*t) from t=0 to 6
plot k(t)=0.0004 + 0.03/1000 - 0.03/1000 * e^(-1000/30*t) from t=0 to 6
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