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D( x )
(16-x^2)^0.5 = 0
16-x^2 < 0
(16-x^2)^0.5 = 0
(16-x^2)^0.5 = 0
-1*x^2 = -16 // : -1
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
16-x^2 < 0
16-x^2 < 0
-1*x^2 < -16
-1*x^2 < -16 // * -1
1*x^2 > 16
1*x^2 > 16 // : 1
x^2 > 16/1
x^2 > 16
x^2 > 16 // ^ 1/2
abs(x) > 4
x in (-oo:-4) U (4:+oo)
x in (-4:4)
1/((16-x^2)^0.5) = 0
x belongs to the empty set
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