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D( y )
100-(100*y^2) < 0
100-(100*y^2) < 0
100-(100*y^2) < 0
100-100*y^2 < 0
-100*y^2 < -100
-100*y^2 < -100 // * -1
100*y^2 > 100
100*y^2 > 100 // : 100
y^2 > 100/100
y^2 > 1
y^2 > 1 // ^ 1/2
abs(y) > 1
y in (-oo:-1) U (1:+oo)
y in <-1:1>
((100-(100*y^2))^(1/2))/2 = 0
((100-100*y^2)^(1/2))/2 = 0
-100*y^2 = -100 // : -100
y^2 = 1
y^2 = 1 // ^ 1/2
abs(y) = 1
y = 1 or y = -1
y in { 1, -1 }
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