You made a mistake in #1:
after you substitute u = ln(x) you should get:
And in #2 you should make .
Thanks guys. Sorry I didn't respond back until today. Well I have more problems which are harder and I don't really know where to start with some of them.
For this one I don't know here to begina
For these two I was never that good in trig. so it's hard for me to understand where to start.
I'm not really looking for answers but I am looking for how to start these problems. Thank you guys