1. The problem statement, all variables and given/known data http://u1.imgupload.co.uk/1257897600/5a0e_image.bmp 2. Relevant equations above 3. The attempt at a solution 1) needs some hints here. may i treat e^2x as (e^x)2 and then apply the formula to get the answers? 2) http://u1.imgupload.co.uk/1257897600/bd3b_1.png i didnt write a full attempt but it is the flow of my thought. did my attempt correct? or in fact there are other easier way to get the answers? 3) http://u1.imgupload.co.uk/1257897600/96d0_2.bmp this one i just wonder whether my work is correct or not. (shown in pic) thx a lots.