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D( x )
(64-x^2)^1 = 0
(64-x^2)^1 = 0
(64-x^2)^1 = 0
64-x^2 = 0
-1*x^2 = -64 // : -1
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in (-oo:-8) U (-8:8) U (8:+oo)
((64-(2*x^2))/((64-x^2)^1))/2 = 0
((64-2*x^2)/(64-x^2))/2 = 0
(64-2*x^2)/(2*(64-x^2)) = 0
-2*x^2 = -64 // : -2
x^2 = 32
x^2 = 32 // ^ 1/2
abs(x) = 4*2^(1/2)
x = 4*2^(1/2) or x = -(4*2^(1/2))
x in { 4*2^(1/2), -(4*2^(1/2)) }
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