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OpenStudy (anonymous):
Let A be the area of a circle with radius r. If , dr/dt=2, find dA/dt when r=1
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OpenStudy (anonymous):
A = pi*r^2 dA/dt = 2 * pi * r * dr/dt dr/dt = 2, r = 1: dA/dt = 2 * pi * 2 = 4 * pi
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