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1)A perfectly spherical snowball melts in such a way that its surface area decreases at the...

1)A perfectly spherical snowball melts in such a way that its surface area decreases at the rate of 1 cm ^ 2 / min. Find how the diameter changes when the radius measures 5 cm.

2)Find the second derivative of y=1/(1+tan(x))^2

3)Find the second derivative using implicite derivation of x^2+4y^2=4

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