In Problems a to d, make the required change in the given equation. a. x2 + y2
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a. x2 + y2 = 9 to cylindrical coordinates
b. x2 - y2 = 25 to cylindrical coordinates
c. x2 + y2 + 4z2 = 10 cylindrical coordinates
d. x2 + y2 + 4z2 = 10 spherical coordinates
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