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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1*(1/4) = 45/x // - 45/x
1*(1/4)-(45/x) = 0
1/4-45*x^-1 = 0
-45*x^-1 = -1/4 // : -45
x^-1 = 1/180
-1 < 0
1/(x^1) = 1/180 // * x^1
1 = 1/180*x^1 // : 1/180
180 = x^1
x = 180
x = 180
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