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D( x )
x^2+7*x+12 = 0
x^2+14*x+45 = 0
x^2+7*x+12 = 0
x^2+7*x+12 = 0
x^2+7*x+12 = 0
DELTA = 7^2-(1*4*12)
DELTA = 1
DELTA > 0
x = (1^(1/2)-7)/(1*2) or x = (-1^(1/2)-7)/(1*2)
x = -3 or x = -4
x^2+14*x+45 = 0
x^2+14*x+45 = 0
x^2+14*x+45 = 0
DELTA = 14^2-(1*4*45)
DELTA = 16
DELTA > 0
x = (16^(1/2)-14)/(1*2) or x = (-16^(1/2)-14)/(1*2)
x = -5 or x = -9
x in (-oo:-9) U (-9:-5) U (-5:-4) U (-4:-3) U (-3:+oo)
(((X^2+13*x+36)/(x^2+7*x+12))*(x^2+5*x+4))/(x^2+14*x+45) = 0
((X^2+13*x+36)*(x^2+5*x+4))/((x^2+7*x+12)*(x^2+14*x+45)) = 0
x^2+7*x+12 = 0
x^2+7*x+12 = 0
DELTA = 7^2-(1*4*12)
DELTA = 1
DELTA > 0
x = (1^(1/2)-7)/(1*2) or x = (-1^(1/2)-7)/(1*2)
x = -3 or x = -4
(x+4)*(x+3) = 0
x^2+5*x+4 = 0
x^2+5*x+4 = 0
DELTA = 5^2-(1*4*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-5)/(1*2) or x = (-9^(1/2)-5)/(1*2)
x = -1 or x = -4
(x+4)*(x+1) = 0
x^2+14*x+45 = 0
x^2+14*x+45 = 0
DELTA = 14^2-(1*4*45)
DELTA = 16
DELTA > 0
x = (16^(1/2)-14)/(1*2) or x = (-16^(1/2)-14)/(1*2)
x = -5 or x = -9
(x+9)*(x+5) = 0
((X^2+13*x+36)*(x+4)*(x+1))/((x+4)*(x+3)*(x+9)*(x+5)) = 0
( X^2+13*x+36 )
X^2+13*x+36 = 0 // - X^2+36
13*x = -(X^2+36) // : 13
x = (-(X^2+36))/13
( x+1 )
x+1 = 0 // - 1
x = -1
( x+4 )
x+4 = 0 // - 4
x = -4
x in { -4}
x in { (-(X^2+36))/13, -1 }
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