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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
0.75*y = 1000/y // - 1000/y
0.75*y-(1000/y) = 0
0.75*y-1000*y^-1 = 0
0.75*y-1000*y^-1 = 0
y^-1*(0.75*y^2-1000) = 0
0.75*y^2 = 1000 // : 0.75
y^2 = 1333.33333333
y^2 = 1333.33333333 // ^ 1/2
abs(y) = 1333.33333333^(1/2)
y = 1333.33333333^(1/2) or y = -1333.33333333^(1/2)
1/y = 0
1*y^-1 = 0 // : 1
y^-1 = 0
y należy do O
y in { 1333.33333333^(1/2), -1333.33333333^(1/2) }
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