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Physics 8 Online
OpenStudy (clarence):

The area of a circular cell changes as a function of its radius, r, and its radius changes with time r = g(t). If dA/dr=f(r), then the total change in area, ΔA between t=0 and t=1 is ΔA=∫ f(g(t))g′(t)dt. This statement sounds true to me. Thoughts?

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