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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a-4 = (4/3)*a // - (4/3)*a
2/a-((4/3)*a)-4 = 0
(-4/3)*a+2/a-4 = 0
2*a^-1-4/3*a^1-4*a^0 = 0
(2*a^0-4/3*a^2-4*a^1)/(a^1) = 0 // * a^2
a^1*(2*a^0-4/3*a^2-4*a^1) = 0
a^1
(-4/3)*a^2-4*a+2 = 0
(-4/3)*a^2-4*a+2 = 0
DELTA = (-4)^2-(2*4*(-4/3))
DELTA = 80/3
DELTA > 0
a = ((80/3)^(1/2)+4)/(2*(-4/3)) or a = (4-(80/3)^(1/2))/(2*(-4/3))
a = -3/8*((80/3)^(1/2)+4) or a = -3/8*(4-(80/3)^(1/2))
a in { -3/8*((80/3)^(1/2)+4), -3/8*(4-(80/3)^(1/2))}
a in { -3/8*((80/3)^(1/2)+4), -3/8*(4-(80/3)^(1/2)) }
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