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D( x )
((64-x^2)^1)/2 = 0
((64-x^2)^1)/2 = 0
((64-x^2)^1)/2 = 0
(64-x^2)/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
(2*(64-2*x^2))/(64-x^2) = 0
( 2 )
2 = 0
x belongs to the empty set
( 64-2*x^2 )
-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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