Regarding $\pi$ as a constant and differentiating with respect to $x$.
$${dS\over dr}=2\times 4\pi r^{2-1}$$
$${dS\over dr}=8\pi r^{1}$$
$${dS\over dr}=8\pi r$$
C'est fini.
JH
High School Mathematics Questions and Answers. Feel free to use the Search bar for this site, just below. The list of Labels in the right hand column below is also useful. Most of the questions on this site are from NSW, Australia curriculum.
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