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A hollow sphere of radius r is being filled with water. The surface area of a hemisphere is 3pi*r^2. Question: When the water is at height r, and filling at a rate of 4cm^3s^-1, what is dS/dT?

If f(x) = sin(2x)/(x^2) find f'(x)

Find the solutions to z^2 = i

Differentiate x^x

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