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D( a )
1.5*a+0.75 = 0
1.5*a+0.75 = 0
1.5*a+0.75 = 0
1.5*a+0.75 = 0 // - 0.75
1.5*a = -0.75 // : 1.5
a = -0.75/1.5
a = -0.5
a in (-oo:-0.5) U (-0.5:+oo)
(1.5*a-(6*a^3))/(1.5*a+0.75) = 0
(1.5*a-6*a^3)/(1.5*a+0.75) = 0
1.5*a-6*a^3 = 0
a*(1.5-6*a^2) = 0
-6*a^2 = -1.5 // : -6
a^2 = 0.25
a^2 = 0.25 // ^ 1/2
abs(a) = 0.25^(1/2)
a = 0.25^(1/2) or a = -0.25^(1/2)
a*(a-0.25^(1/2))*(a+0.25^(1/2)) = 0
(a*(a-0.25^(1/2))*(a+0.25^(1/2)))/(1.5*a+0.75) = 0
( a+0.25^(1/2) )
a+0.25^(1/2) = 0 // - 0.25^(1/2)
a = -0.25^(1/2)
( a-0.25^(1/2) )
a-0.25^(1/2) = 0 // + 0.25^(1/2)
a = 0.25^(1/2)
( a )
a = 0
a in { -0.25^(1/2)}
a in { 0.25^(1/2), 0 }
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