Justify rigorously the given set is open in R³. (a) A = {(x, y, z) |x>0, y<0, x² + y² +2²> 9}. (b) B = {(x, y, z) | x² + y² < 25,0

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Justify rigorously the given set is open in R³.
(a) A = {(x, y, z) | x > 0, y < 0, x² + y² + z² >9}.
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(b) B = {(x, y, z) | x² + y² < 25,0 < z < 25 − x² − y²}.
Transcribed Image Text:Justify rigorously the given set is open in R³. (a) A = {(x, y, z) | x > 0, y < 0, x² + y² + z² >9}. - (b) B = {(x, y, z) | x² + y² < 25,0 < z < 25 − x² − y²}.
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