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[contact-form-7 id="3259" title="Unsubcribe"]Wow, how useful. … I always had a hard time with the chain rule, until I watched this video. The right presentation makes all the difference. Thank you very much. … These 20 second math videos you’ve graciously posted are excellent. I’m my little corner of the world, you’ve done great things.
avaratatat (on a CCM YouTube video about the Chain Rule)
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