User talk:IJM98

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20:03, 11 August 2017 (UTC)

Please be more careful

Hi there, please be more careful when removing content as you did here. That edit had the following two problems: (1) some of the terms ("product rule" and "chain rule") were indeed mentioned in the original source, and (2) you destroyed the pointer to the image. So next time, before you remove sourced content, please verify the source first, and before you hit Save changes, please use the Show preview function to verify. Thanks and happy editing. - DVdm (talk) 08:39, 31 August 2017 (UTC)[reply]