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Thanks~actually the problem is a little bit more complicated, here is the original expression:[mcode]E^(-k22 t) ((0.5 b2 bb1^2 (-1 + E^(-k22 t)))/k22 - ( 0.5 b2 c1^2 (-1 + E^(k22 t)))/k22 - ( 0.5 a1^2 b2 (-1 + E^((k22 - 2 k33) t)))/(k22 - 2 k33)...