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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4 = Y/10000 // - Y/10000
x^-4-(Y/10000) = 0
1*x^-4 = -(-1/10000*Y) // : 1
x^-4 = 1/10000*Y
-4 < 0
1/(x^4) = 1/10000*Y // * x^4
1 = 1/10000*Y*x^4 // : 1/10000*Y
10000*Y^-1 = x^4
x^4 = 10000*Y^-1 // ^ 1/4
abs(x) = 10*Y^(-1/4)
x = 10*Y^(-1/4) or x = -(10*Y^(-1/4))
x in { 10*Y^(-1/4), -(10*Y^(-1/4)) }
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