Next consider a rigid body with 3 equally spaced masses:
Ixx = sum (y^2)dm = 1+sin(30)^2+sin(30)^2 = 1.5
Iyy = sum(x^2) dm = cos(30)^2 + cos(30)^2 = 0.75 + 0.75 = 1.5
Ixy = sum(x*y)dm = sin(30) * cos (30)  sin(30) * cos (30) = 0
det[M] = Ixx Iyy  Ixy Ixy = 1.5*1.5 = 2.25
for =1.5
x/y = 0/(1.51.5) = 0/0 = undefined.
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