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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
N = (x-t^2)/x // - (x-t^2)/x
N-((x-t^2)/x) = 0
(-1*(x-t^2))/x+N = 0
(-1*(x-t^2))/x+(N*x)/x = 0
N*x-1*(x-t^2) = 0
N*x+t^2-x = 0
N*x+t^2-x = 0
N*x+t^2 = 0 // - t^2
N*x = -t^2 // : N
x = (-t^2)/N
N^-1*t^2+x = 0
(N^-1*t^2+x)/x = 0
(N^-1*t^2+x)/x = 0 // * x
N^-1*t^2+x = 0
N^-1*t^2+x = 0 // - N^-1*t^2
x = -(N^-1*t^2)
x = -(N^-1*t^2)
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