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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = y/36 // - y/36
1/y-(y/36) = 0
1*y^-1-1/36*y^1 = 0
(1*y^0-1/36*y^2)/(y^1) = 0 // * y^2
y^1*(1*y^0-1/36*y^2) = 0
y^1
(-1/36)*y^2+1 = 0
(-1/36)*y^2+1 = 0
DELTA = 0^2-(1*4*(-1/36))
DELTA = 1/9
DELTA > 0
y = ((1/9)^(1/2)+0)/(2*(-1/36)) or y = (0-(1/9)^(1/2))/(2*(-1/36))
y = -6 or y = 6
y in { -6, 6}
y in { -6, 6 }
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