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so I tried using the chain rule for dz/ds and started with first d second + second d first and used the chain rule by plugging in the value of r and 0 when taking the derivatives but my answer is completely different than the books answer... can someone show me the steps real detailed explaining each step so I can just make sure I'm doing this the right way again? After reading my notes I thought I was supposed to do the multiplication rule combined with the chain rule but it's coming out differently..

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    $\begingroup$ It seems that in the past, others have done the mathematical typesetting before you on every question. Here’s the MathJax tutorial $\endgroup$ – gen-z ready to perish Oct 14 '17 at 2:01
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    $\begingroup$ Follow Example 3 on page 940 of your textbook. $\endgroup$ – zipirovich Oct 14 '17 at 3:34

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