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D( x )
7*x < 0
2*(7*x)^(1/2) = 0
7*x < 0
7*x < 0
7*x+0 < 0 // - 0
7*x < 0 // : 7
x < 0/7
x < 0
2*(7*x)^(1/2) = 0
2*(7*x)^(1/2) = 0
2*7^(1/2)*x^(1/2) = 0 // : 2*7^(1/2)
x^(1/2) = 0
x = 0
x in (0:+oo)
7*(1/(2*(7*x)^(1/2))) = 0
(7/(2*7^(1/2)))*x^(-1/2) = 0 // : 7/(2*7^(1/2))
x^(-1/2) = 0
x należy do O
x belongs to the empty set
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