*Math TV*, which provides videos of worked-through high school level mathematics problems.

There are two sites: MathTV, which has problems presented by a couple of different people, and a YouTube site, which contains a lot more problems, all of which seem to be presented by the same guy.

That's OK, because I think he does the best job, anyway.

Unfortunately, they've disabled embedding, but click on the image for a nice example of

*integration by substitution*... although I think the last one could have been explained more simply than by using polynomial long-division!

All up, a nice resource.

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