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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y/(y^2)-(2*y)-(3/y)-15+3 = 0
y/(y^2)-2*y-3*y^-1-15+3 = 0
-2*y^1-2*y^-1-12*y^0 = 0
(-2*y^2-12*y^1-2*y^0)/(y^1) = 0 // * y^2
y^1*(-2*y^2-12*y^1-2*y^0) = 0
y^1
-2*y^2-12*y-2 = 0
-2*y^2-12*y-2 = 0
DELTA = (-12)^2-(-2*(-2)*4)
DELTA = 128
DELTA > 0
y = (128^(1/2)+12)/(-2*2) or y = (12-128^(1/2))/(-2*2)
y = (8*2^(1/2)+12)/(-4) or y = (12-8*2^(1/2))/(-4)
y in { (8*2^(1/2)+12)/(-4), (12-8*2^(1/2))/(-4)}
y in { (8*2^(1/2)+12)/(-4), (12-8*2^(1/2))/(-4) }
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