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D( a )
6*a^2-a-2 = 0
6*a^2-a-2 = 0
6*a^2-a-2 = 0
6*a^2-a-2 = 0
DELTA = (-1)^2-(-2*4*6)
DELTA = 49
DELTA > 0
a = (49^(1/2)+1)/(2*6) or a = (1-49^(1/2))/(2*6)
a = 2/3 or a = -1/2
a in (-oo:-1/2) U (-1/2:2/3) U (2/3:+oo)
(4*a^2-(4*a)-3)/(6*a^2-a-2) = 0
(4*a^2-4*a-3)/(6*a^2-a-2) = 0
4*a^2-4*a-3 = 0
4*a^2-4*a-3 = 0
DELTA = (-4)^2-(-3*4*4)
DELTA = 64
DELTA > 0
a = (64^(1/2)+4)/(2*4) or a = (4-64^(1/2))/(2*4)
a = 3/2 or a = -1/2
(a+1/2)*(a-3/2) = 0
6*a^2-a-2 = 0
6*a^2-a-2 = 0
DELTA = (-1)^2-(-2*4*6)
DELTA = 49
DELTA > 0
a = (49^(1/2)+1)/(2*6) or a = (1-49^(1/2))/(2*6)
a = 2/3 or a = -1/2
(a+1/2)*(a-2/3) = 0
((a+1/2)*(a-3/2))/((a+1/2)*(a-2/3)) = 0
( a+1/2 )
a+1/2 = 0 // - 1/2
a = -1/2
( a-3/2 )
a-3/2 = 0 // + 3/2
a = 3/2
a in { -1/2}
a = 3/2
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