if x^2+y^2=a where a is a non-zero constant, which of the following conditions are necessary for

if x^2+y^2=a where a is a non-zero constant, which of the following conditions are necessary for

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\[\frac{ d ^{2}y }{ dx ^{2} }>0\]
a. y<0
b. y>0
c. x>0

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yes

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