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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (1/2)*x^-15 // - (1/2)*x^-15
y-((1/2)*x^-15) = 0
(-1/2)*x^-15+y = 0
-1/2*x^-15 = -y // : -1/2
x^-15 = 2*y
-15 < 0
1/(x^15) = 2*y // * x^15
1 = 2*x^15*y // : 2*y
1/(2*y) = x^15
x^15 = 1/(2*y) // ^ 1/15
x = 1/(2^(1/15)*y^(1/15))
x = 1/(2^(1/15)*y^(1/15))
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