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D( x )
49-x^2 = 0
49-x^2 = 0
49-x^2 = 0
-1*x^2 = -49 // : -1
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
x in (-oo:-7) U (-7:7) U (7:+oo)
-2*(1/2)*x*(((49-x^2)^-1)/2) = 0
-x/(2*(49-x^2)) = 0
-1*x = 0 // : -1
x = 0
x = 0
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