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D( h )
(h^3)/2 = 0
(h^3)/2 = 0
(h^3)/2 = 0
1/2*h^3 = 0 // : 1/2
h^3 = 0
h = 0
h in (-oo:0) U (0:+oo)
((225*h)/2)/((h^3)/2) <= 1 // - 1
((225*h)/2)/((h^3)/2)-1 <= 0
225*h^-2 <= 1
225*h^-2 <= 1 // : 225
h^-2 <= 1/225
1/(h^2) <= 1/225
h <> 0
1/(h^2) <= 1/225 // * h^4
(h^4)/(h^2) <= 1/225*h^4
h^2 <= 1/225*h^4
h^2-1/225*h^4 <= 0
h^2*(1-1/225*h^2) <= 0
h^2*(1-1/225*h^2) <= 0 // : h^2
1-1/225*h^2 <= 0
1 <= 1/225*h^2 // : 1/225
1/1/225 <= h^2
h^2 >= 1/1/225 // ^ 1/2
abs(h) >= 15
h in (-oo:-15> U <15:+oo)
h in (-oo:-15> U <15:+oo)
(-oo:-15> U <15:+oo)
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