Can you solve the problem no. 216 in the atachment ?!
i know I will need the substitution u = ln t at the first
and then ??
I wasted 2 hours ;(
then i tried k = u-1 or k = u+1 but it didnt work ..
another Question: in problem no.220 :
a = 1 , Right ?
just check it if its right or not, You are not need to solve it for me
sorry for my bad english ;x