Hi

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

Thank you

sorry for my bad english ;x