Question: Limits in maple

Hi, I want to make a plot for different scenarios or limits, but I am not sure if this is possible, so if i have the equation 

X:=A*exp(-a*t)+B*exp(-b*t);

where a and b are pre-defined constants i.e. 1 and 2. I want to plot this for when A>>B, A=B and A<<B, is this possible in maple? 

 

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