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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
180 = 90/x // - 90/x
180-(90/x) = 0
180-90*x^-1 = 0
-90*x^-1 = -180 // : -90
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x = 1/2
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