So the is inside the csc? That is, it is which is not quite what you wrote.
Once you have make the further substitution or, equivalently, make the original substitution rather than just u= 3x+ 5.
I have to integrate by substitution:
between 8/3 and 2
tried making (3x+5)=u to give:
I'm not sure if this is correct though, and I don't know how to integrate trig functions when the variable has a coefficient. Please help.