The total surface area S of a right circular cylinder is related to the base radius r and height h by the equation S=2πr^2+2πrh
a) How is dS/dt related to dr/dt and dh/dt if neither r nor h is a constant?
b) How is dS/dt related to dr/dt if h is constant?
c) How is dS/dt related to dr/dt if r is constant?
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