What are some helpful websites for understanding concepts in Calc II?

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Helpful Calc II websites??

Im not sure if this is the appropriate thread for this question so I apologize in advance if its not. I am taking a calc II class, but my professor has a horrible accent along with the complete inability to teach. My professor spends the entire lecture doing example problems with little explantation. I would like to hear/read some explanation/conceptual reasoning so i can understand why I am looking for convegence/divergence or why I am doing cetain things. I've found a website called Pauls Online notes which is helpful at times. But I am curious if anyone else knows of helpful websites (or any other means e.g. books) that can tell me why and not just how to do a problem.
 
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I haven't checked it out for myself, but Khan Academy is supposed to be pretty good.
 


I'll give that a shot. It seems in this class I am only learning the mechanics of how to do problems and not the concepts..which seems to be abosutely detrimental to a student trying to continue on to higher mathmatics
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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