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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 4*w^2+450/x // - 4*w^2+450/x
y-(4*w^2)-(450/x) = 0
y-4*w^2-450*x^-1 = 0
-450*x^-1 = -(y-4*w^2) // : -450
x^-1 = (y-4*w^2)/450
-1 < 0
1/(x^1) = (y-4*w^2)/450 // * x^1
1 = x^1*((y-4*w^2)/450) // : (y-4*w^2)/450
450*(y-4*w^2)^-1 = x^1
x = 450*(y-4*w^2)^-1
x = 450*(y-4*w^2)^-1
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