Hello. I'm sort of confused about when you can integrate... Say for example if you have dx you're sort of integrating a "hidden" constant, right? So you increase the power by one and either use the upper and lower limit or just add c: x+c. And similarly if you have xdx, again you increase the power by one and divide:0.5x^2, right? But when are you allowed to integrate? Namely, must you always first obtain dx or dvariable somehow? How do I obtain this in the following case for example: Y=2x? If it is not necessary, then what difference is there in integrating x or xdx? THANK YOU SO MUCH FOR YOUR HELP!!!