Integration by Substitution

I've been feeling very tired these days. I guess I've been drifting around somewhat as far as spiritual issues are concerned too. Not good.

I did loads of Integration by Substitution today. Worksheet 3 is loaded with hard problems; I cleared all but the final one of 5 and another random one in question 5 today.

I just feel some degree of uncertainty... I don't know why. I may be applying myself too hard in the wrong direction.

jk.