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If you send me a message or a testimonial, the database will retain a record your email address (if you provide it), the time and date your message was sent, and the message itself. I will remove your message and e-mail address three years after you last contacted me unless you request that I do so earlier. I will, however, retain any testimonies that you may have provided (thank you). I will not disclose your information to third parties, unless required by law (although I have difficulty imagining any scenario in which this may be required).
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At this stage CrystalClearMaths is a totally free web site and will not directly request your address or payment details. In time, I may develop a store and will then need to ensure that you can make secure transactions through the site. Until then, the only financial transaction(s) that you may have with me is if you make a donation via PayPal, in which case you will be directed to the PayPal secure server for that purpose (and you will be subject to their security provisions).
If there are any changes to this policy, they will be posted on this page. Your use of this CrystalClearMaths website indicates that you have read, understood and accepted the terms made clear in this policy.
Thanks for this video, I was having a lot of trouble with the chain rule, I studied the text book (very confusing) and several other videos, but I found your video most helpful, and I new feel I really do understand it.
MeijinSensei (on a CCM YouTube video about the Chain Rule)
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