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D( x )
y^7 = 0
(75*x)/(y^7) < 0
y^7 = 0
y^7 = 0
y^7 = 0
x należy do R
(75*x)/(y^7) < 0
(75*x)/(y^7) < 0
(75*x)/(y^7) = 0
75*x*y^-7 = 0 // : 75*y^-7
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x belongs to the empty set
((75*x)/(y^7))^(1/2) = 0
x belongs to the empty set
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